Guillaume Morin

Directeur de recherches au CNRS

Equipe Minéralogie Environnementale

Institut de Minéralogie, Physique des Matériaux et Cosmochimie (IMPMC)
UMR 7590 Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie (UPMC/Paris6/Sorbonne Universités) - Institut de Recherches pour le Développement (IRD)
Campus Jussieu, Tour 23, 5e étage, couloir 23-24, 4 place Jussieu, 75005 Paris

Tel: +33 1 44 27 75 04 ; Fax: +33 1 44 27 37 85
E-mail: guillaume.morin@.upmc.fr  

    
  

CURRICULUM VITAE

Guillaume MORIN

Habilitation à Diriger des Recherches à l’Université Pierre et Marie Curie (UPMC) (2006)
 “ Cristallochimie des éléments traces dans les milieux de basse température: Implications géochimiques          
et environnementales.”


Directeur de Recherches au CNRS (2009- )

Chargé de Recherches au CNRS (1996-2009)

Post-Doctorat (1994-1996) CEA VALRHO, Marcoule “Métaux lourds dans les minéraux et les verres de stockage de déchets radioactifs.” 

Doctorat de Géochimie Fondamentale et Appliquée de l’Université Paris 7 (1994)
 “Cristallochimie du fer dans les bauxites. Application au gisement de Bidi-Koum, Guinée”

Ingénieur de l’Ecole Nationale Supérieure de Géologie de Nancy (1991)


Animation de la recherche:

Responsable de l'équipe “Minéralogie Environnementale” de l'IMPMC (2005 -)
Représentant de l’IMPMC pour la Fédération Ile-de-France de Recherche en Environnement (FIRE) (2007 - )
Membre du Conseil Scientifique de l'IMPMC (2005 -)
Membre nommé de la Commission sectorielle CSS1 de l'IRD (2009-2011)
Membre nommé de la Section 30 (Surface continentale et interfaces) du CN du CNRS (2016- )
Membre nommé de la Section 20 (Surface continentale et interfaces) du CN du CNRS (2005-2007)
Membre élu du Conseil Scientifique de l’UFR 918 UPMC « Terre Environnement Biodiversité » (2011-)
Membre des Commissions de Spécialistes de l’UFR 918 UPMC« Terre Environnement Biodiversité » (2011-)
Membre du Conseil Scientifique des lignes synchrotron CRG Françaises (2011-)
Membre du Stanford Environmental Molecular Science Institute (2004 - 2008)
Membre de la Geochemical Division de l'American Chemical Society (2006)
Editeur associé à European Journal of Mineralogy (2005 - 2008)
Expert pour le Stanford Synchrotron Radiation Lightsource, ANR, EC2CO-INSU
Coordination de 3 projets internationaux (CNRS-NSF, Stanford Synchrotron Radiation Lab)
Coordination de 7 projets nationaux (ACI/MESR, Région IDF, MINEFI, INSU)
Responsabilité de 5 contrats (semi-)privés (Aluminium Pechiney, BRGM, ADEME, KNS)

Enseignement et Encadrement

Responsable du parcours "Géochimie Environnementale" du Master 2 SDUEE - ECH - UPMC
Responsable UE 4UC01 "Chimie Environnementale" du Master 1 SDUEE - Environnements Continentaux Hydrosciences (ECH) - UPMC
Enseignements UE Physique et Chimie des Milieux Naturels du M2 Master Sciences des Matériaux et Nano-objets de l’UPMC (2016 -)
Responsable UE Matériaux Biologie Environnement du M2 SMNO de l’UPMC (2010-2016)
Enseignements Master National Argiles (2009-2014)

3 Direction de Post-Doctorat  - 8 Directions de thèses  - 15 Co-encadrements de thèse

12 jurys de thèse dont 7 comme rapporteur et 1 comme président
3 jurys HDR dont 2 comme président

Publications 

Highlight, European Synchrotron Radiation Facility (2001)                  
Best paper Award, American Mineralogist, Mineralogical Society of America (1999)
114 publications de rang A (ISI 3200 citations, indice h39),13 Proceedings, 4 chapitres de livres, 1 brevet
13 conférences invitées internationales (American Geophysical Union, International Mineralogical Association, Goldschmidt Conference, Stanford Environmental Science Institute)

Collaborations principales

Fédération Ile de France en Environnement (FIRE) (METIS, ECOSYS)
Hydrosciences (Montpellier)
Géochimie des eaux (Paris 7)
ESRF CRG - FAME (Grenoble)
Géosciences Rennes (CAREN)
IRSN (Fontenay aux Roses)
SAMBA Synchrotron Soleil (Orsay)
ISTERRE Grenoble
BRGM Orléans

Stanford Synchrotron Radiation Lightsource
Dept. Geological & Environmental Science (Stanford University)
Gemicrobiology Group (Tuebingen University)
Max Planck Institute, Berlin

Publications

2017

Fernandez-Rojo L., Héry M., Le Pape P., Braungardt C., Desoeuvre A., Torres E., Tardy V., Resongles E., Laroche E., Delpoux S., Jouliand C., Battaglia-Brunet F., Boisson J., Grapin G., Morin G., Casiot C. (2017) Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD). Water Research (in press).

Noël V., Juillot F., Morin G., Marchand C., Ona-Nguema G., Viollier E., Prevot F., Dublet G., Maillot F., Delbes L., Marakovic G., Bargar J.R., Brown Jr. G.E. (2017) Oxidation of Ni-rich mangrove sediments after isolation from the sea (Dumbea Bay, New Caledonia): Fe and Ni behavior and environmental implications. ACS Earth and Space Chemistry (in press).

Le Pape P., Battaglia-Brunet F., Parmentier M., Joulian C., Gassaud C., Fernandez-Rojo L., Guigner J-M., Ikogou M., Stetten L., Olivi L., Casiot C., Morin G. (2017) Complete removal of arsenic and zinc from a heavily contaminated Acid Mine Drainage via an indigenous SRB consortium. Journal of Hazardous Materials 321, 764-772.

Le Pape P., Blanchard M., Brest J., Boulliard J.C., Ikogou M., Stetten L., Wang S., Landrot G., Morin G. (2017) Arsenic incorporation in pyrite at ambient temperature at both tetrahedral S-I and octahedral Fe+II sites: evidence from EXAFS-DFT analysis. Environmental Science and Technology 51, 150−158.

Ikogou, M, Ona-Nguema, G, Juillot, F, Le Pape, P, Menguy, N, Richeux, N, Guigner, JM, Noel, V, Brest, J, Baptiste, B, Morin G (2017) Long-term sequestration of nickel in mackinawite formed by Desulfovibrio capillatus upon Fe(III)-citrate reduction in the presence of thiosulfate. Applied Geochemistry 80, 143-154.

Till, JL, Guyodo, Y, Lagroix, F, Morin, G, Menguy, N, Ona-Nguema, G. (2017) Presumed magnetic biosignatures observed in magnetite derived from abiotic reductive alteration of nanogoethite. Comptes Rendus Geoscience 349, 63-70. 


2016


Baumgartner J., Menguy N., Gonzalez T.P., Morin G., Widdrat M., Faivre D. (2016) Elongated magnetite nanoparticle formation from a solid ferrous precursor in a magnetotactic bacterium. Journal of the Royal Society, Interface 13, 20160665.

Resongles E., Le Pape P., Fernandez-Rojo L., Morin G., Delpoux S., Brest J., Guo S. and Casiot C. (2016) Routine determination of inorganic arsenic speciation in precipitates from acid mine drainage using orthophosphoric acid extraction followed by HPLC-ICP-MS. Analytical methods 2016,8, 7420-7426.

Volant A., Héry M., Desoeuvre A., Casiot C., Morin G., Bertin P.N., Bruneel O. (2016) Spatial Distribution of Eukaryotic Communities Using High-Throughput Sequencing Along a Pollution Gradient in the Arsenic-Rich Creek Sediments of Carnoulès Mine, France. Microbial Ecology 72, 608-620.

Bonnot C., Gélabert A., Louvat P., Morin G., Proux O., Benedetti M.F. (2016) Trace metals dynamics under contrasted land uses: contribution of statistical, isotopic and EXAFS approaches. Environmental Science and Pollution Research doi:10.1007/s11356-016-6901-0, pages 1-21.

Othmane G., Allard T., Vercouter T., Morin G., Fayek M., Calas G. (2016) Luminescence of uranium-bearing opals: Origin and use as a pH record. Chemical Geology 423, 1-6.

Miot J., Lu S., Morin G., Adra A., Benzerara K., Küsel K. (2016) Iron mineralogy across the oxycline of a lignite mine lake. Chemical Geology 434, 28-42.

Muehe E.M., Morin G., Scheer L., Le Pape P., Esteve I., Daus B., Kappler A. (2016) Arsenic(V) incorporation in vivianite during microbial reduction of arsenic(V)-bearing biogenic Fe(III) (oxyhydr)oxides. Environmental Science and Technology 50, 2281-2291.

Morin G., Mangeret A., Othmane G., Stetten L., Seder-Colomina M., Brest J., Ona-Nguema G., Bassot S., Courbet C., Guillevic J., Thouvenot A., Mathon O., Proux O., Bargar J.R. (2016) Mononuclear U(IV) complexes and ningyoite as major uranium species in lake sediments. Geochemical Perspectives Letters 2, 95-105.

Adra A., Morin G., Ona-Nguema G., Brest J. (2016) Arsenate and Arsenite Adsorption onto Al-containing ferrihydrites. Implications for Arsenic Immobilization After Neutralization of Acid Mine Drainage. Applied Geochemistry 64, 2-9. doi:10.1016/j.apgeochem.2015.09.015


2015


Seder-Colomina M., Morin G., Brest J., Ona-Nguema G., Gordien N., Pernelle J.J., Banerjee D., Mathon, O., Esposito G., Van Hullebusch E. (2015) Uranium(VI) scavenging by amorphous iron phosphate encrusting Sphaerotilus natans filaments. Environmental Science and Technology 49, 14065–14075. DOI: 10.1021/acs.est.5b03148

Noël V.,  Morin G., Juillot F., Marchand C., Brest J., Bargar J.R., Muñoz M., Marakovic G., Ardo S., Brown Jr. G.E. (2015) Ni cycling in mangrove sediments from New Caledonia. Geochimica et Cosmochimica Acta 169, 82–98.

Ardo S.G., Nelieu S., Ona-Nguema G., Delarue G, Brest J., Elsa P., Morin G. (2015) Oxidative Degradation of Nalidixic Acid by Nano-magnetite via Fe2+/O2-Mediated Reactions. Environmental Science and Technology 49, 4506-4514.

Dublet G., Juillot F., Morin G., Fritsch E.,  Fandeur D., Brown Jr G.E. (2015) Goethite aging explains Ni depletion in upper units of ultramafic lateritic ores from New Caledonia. Geochimica et Cosmochimica Acta 160, 1-15.

Seder-Colomina M., Goubet A., Lacroix S., Morin G., Ona-Nguema G., Esposito G., van Hullebusch E. D., Pernelle J-J.,  (2015) Moderate oxygen depletion as a factor favouring the filamentous growth of Sphaerotilus natans. Antonie van Leeuwenhoek 107, 1135-1144.

Marsac R., Davranche M., Morin G., Takahashi Y., Gruau G., Dia A. (2015) Effect of loading on the nature of the REE-humate complexes as determined by Yb3+ and Sm3+ LIII-edge EXAFS analysis. Chemical Geology 396, 218-227.

Till J.L., Guyodo Y., Lagroix F., Morin G., Ona-Nguema G. (2015) Goethite as a potential source of magnetic nanoparticles in sediments. Geology 43, 75-78.


2014

Wang Y.H., Morin G., Ona-Nguema G., Brown G.E. Jr. (2014) Arsenic(III) and Arsenic(V) Speciation during Transformation of Lepidocrocite to Magnetite. Environmental Science and Technology 48, 14282-14290.

Seder-Colomina M., Morin G., Benzerara K., Ona-Nguema G., Pernelle J-J., Esposito G., van Hullebusch E. D. (2014) Sphaerotilus natans, a neutrophilic iron-related sheath-forming bacterium: perspectives for metal remediation strategies. Geomicrobiology Journal 31, 64-75.

Le Pape P., Quantin C., Morin G., Jouvin D., Kieffer I., Proux O., Ghanbaja J., Ayrault S. (2014) Zinc Speciation in the Suspended Particulate Matter of an Urban River (Orge, France): Influence of Seasonality and Urbanization Gradient. Environmental Science and Technology 48, 11901-11909.

Guerbois G., Ona-Nguema G., Morin G., Abdelmoula M., Laverman A. M., Mouchel J.M, Barthelemy K., Brest J. (2014) Nitrite reduction by biogenic hydroxycarbonate green rust: Evidence for a nitrite green rust as intermediate reaction product. Environmental Science and Technology 48, 4505-4514.

Dublet G., Juillot F., Morin G., Fritsch E., Noel V., Brest J., Brown Jr. G.E. (2014) XAS Evidence for Ni Sequestration by Siderite in a Lateritic Ni-Deposit from New Caledonia American Mineralogist 99, 225-234.

Cosmidis J., Benzerara K., Morin G., Busigny V., Lebeau O, Jezequel D., Noël G., Dublet G., Othmane G. (2014) Biomineralization of iron-phosphates in the water column of Lake Pavin (Massif Central, France). Geochimica et Cosmochimica Acta 126, 78-96.

Noël V., Marchand C., Juillot F., Ona-Nguema G., Viollier E., Marakovic G., Olivi L., Delbes L., Gelebart F., Morin G. (2014) EXAFS analysis of iron cycling in mangrove sediments downstream of a lateritized ultramafic watershed (Vavouto Bay, New Caledonia). Geochimica et Cosmochimica Acta 136, 211-228.

Blanchard M., Balan E., Giura P., Béneut K., Yi H., Morin G., Pinilla C., Lazzeri M., Floris A. (2014) Infrared spectroscopic properties of goethite : anharmonic broadening, long-range electrostatic effects and Al substitution. Physics and Chemistry of Minerals 41, 289-302.

Yi H., Balan E., Gervais C., Ségalen L., Roche D., Person A., Fayon F., Morin G., Babonneau F. (2014) Probing atomic scale transformation of fossil dental enamel using Fourier transform infrared and nuclear magnetic resonance spectroscopy: A case study from the Tugen Hills (Rift Gregory, Kenya). Acta Biomaterialia 10, 3952 -3958.

2013

Adra A., Morin G., Ona-Nguema G., Menguy N., Maillot F., Bruneel O., Casiot C., Lebrun S., Juillot F., Brest J. (2013) Arsenic scavenging by aluminum-substituted ferrihydrites in a circumneutral pH river impacted by acid mine drainage. Environmental Science and Technology 47, 12784-12792.

Baumgartner J., Morin G., Menguy N., Perez Gonzalez T., Widdrat M., Cosmidis J., Faivre D. (2013) Magnetotactic bacteria form magnetite from a phosphate-rich ferric hydroxide via nanometric ferric (oxyhydr)oxide intermediates. Proceedings of the National Academy of Sciences of the United States of America 110, 14883-14888.

Maillot F., Morin G., Juillot F., Bruneel O., Casiot C., Ona-Nguema G., Wang Y., Lebrun S., Aubry E., Vlaic G., Brown Jr. G.E. (2013) Structure and reactivity of As(III)- and As(V)-rich schwertmannites and amorphous ferric arsenate sulfate from the Carnoulès acid mine drainage, France: Comparison with biotic and abiotic model compounds and implications for As remediation. Geochimica et Cosmochimica Acta 104, 310-329.

Othmane G., Allard T., Morin G., Sélo M., Llorens I., Chen H., Bargar J., Fayek M. and Calas G. (2013) Uranium association with iron-bearing phases in mill tailings from Gunnar, Canada.  Environmental Science and Technology  47, 12695-12702.

Othmane G., Allard T., Menguy N., Morin G., Esteve I., Fayek M., Calas G. (2013) Letter: Evidence for nanocrystals of vorlanite, a rare uranate mineral, in the Nopal I low-temperature uranium deposit (Sierra Peña Blanca, Mexico) American Mineralogist 98, 518-521.

Yi H., Balan E., Gervais C., Segalen L., Fayon F., Roche D., Person A., Morin G., Guillaumet M., Blanchard M., Lazzeri M., Babonneau F. (2013) Letter : A carbonate-fluoride defect model for carbonate-rich fluorapatite. American Mineralogist  98, 1066-1069.

2012

Blanchard M., Morin G., Lazzeri M., Balan E., Dabo I. (2012) First-principles simulation of arsenate adsorption on the (1(1)over-bar2) surface of hematite. Geochimica et Cosmochimica Acta 86, 182-195.

Dublet G., Juillot F., Morin G., Fritsch E., Fandeur D., Ona-Nguema G., Brown Jr. G.E. (2012) Ni speciation in a New Caledonian lateritic regolith: A quantitative X-ray absorption spectroscopy investigation. Geochimica et Cosmochimica Acta 95, 119-133.

Volant, A ; Desoeuvre, A ; Casiot, C ; Lauga, B ; Delpoux, S ; Morin, G ; Personne, JC ; Hery, M ; Elbaz-Poulichet, F ; Bertin, PN ; Bruneel, O. (2012) Archaeal diversity: temporal variation in the arsenic-rich creek sediments of Carnoules Mine, France. Extremophiles 16(4), 645-657.

Guyodo Y., Sainctavit P., Arrio M.A., Carvallo C., Penn R.L., Erbs J.J., Forsberg B.S., Morin G., Maillot F., Lagroix F., Bonville P., Wilhelm F., Rogalev A. (2012) X-ray magnetic circular dichroïsm provides strong evidence for tetrahedral iron in ferrihydrite. Geochemistry Geophysics Geosystems 13, Q06Z44.

Priadi C., Le Pape P., Morin G., Ayrault S., Maillot F., Juillot F., Hochreutener R., Llorens I., Testemale D., Proux O., and Brown G.E., Jr. (2012) X-ray absorption fine structure evidence for amorphous zinc sulfide as a major zinc species in suspended matter from the Seine river downstream of Paris, Ile-de-France, France. Environmental
Science & Technology 46, 3712–3720.

Pantke, C., Obst M., Benzerara K., Morin G., Ona-Nguema G., Dippon U., Kappler A. (2012) Green rust formation during Fe(II) oxidation by the nitrate-reducing Acidovorax sp. strain BoFeN1. Environmental Science & Technology, 46, 1439-1446.

2011

Charlet L, Morin G, Rose J, Wang YH, Auffan M, Burnol A, Fernandez-Martinez A (2011) Reactivity at (nano)particle-water interfaces, redox processes, and arsenic transport in the environment. Comptes Rendus Geoscience, 343 (2-3): 123-139.

Maillot F., Morin G., Wang Y., Bonnin D., Ildefonse P., Chaneac C., Calas G. (2011). New insight into the structure of nanocrystalline ferrihydrite : EXAFS evidence for tetrahedrally coordinated iron(III). Geochimica et Cosmochimica Acta 75(10), 2708-2720.

Hohmann C., Morin G., Ona-Nguema G., Guigner J.M., Brown  Jr. G.E., Kappler A. (2011) Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1. Geochimica et Cosmochimica Acta 75(17), 4699-4712.

Wang YH; Morin, G; Ona-Nguema, G; Juillot, F; Calas G; Brown, GE (2011) Distinctive Arsenic(V) Trapping Modes by Magnetite Nanoparticles Induced by Different Sorption Processes. Environmental Science & Technology, 45, 7258-7266.

Juillot F., Maréchal C., Morin G.,  Jouvin D., Cacaly S., Telouk P., Benedetti M., Ildefonse P., Sutton S., Guyot F., Brown Jr. G.E. (2011) Contrasting isotopic signatures between anthropogenic and geogenic Zn and evidence for post-depositional fractionation processes in smelter-impacted soils from Northern France. Geochimica et Cosmochimica Acta 75(9), 2295-2308.

Benzerara, Karim; Miot, Jennyfer; Morin, Guillaume (2011) How some bacteria can oxidize iron in the absence of dioxygen: implications for environmental science and the search of ancient traces of life. Actualite Chimique 356, 102-104.

Benzerara K, Miot J, Morin G, Ona-Nguema G, Skouri-Panet F, Ferard C. (2011) Significance, mechanisms and environmental implications of microbial biomineralization. Comptes Rendus Geoscience, 343 (2-3): 160-167.

Balan E, Fritsch E, Allard T., Morin G, Guillaumet M, Delattre S, Blanchard M, Calas G. (2011) Spectroscopic investigation and theoretical modeling of kaolinite-group minerals and other low-temperature phases. Comptes Rendus Geoscience, 343 (2-3): 177-187.

Balan E., Delattre S., Roche D., Segalen L., Morin G, Guillaumet M. Blanchard M., Lazzeri M., Brouder C., Salje E.K.H. (2011) Line-broadening effects in the powder infrared spectrum of apatite. Physics and Chemistry of Minerals 38(2), 111-122.

Bruneel O., Volant A., Gallien S., Chaumande B., Casiot C., Carapito C., Bardil A., Morin G., Brown G.E., Jr., Personne C.J., Le Paslier D., Schaeffer C., Van Dorsselaer Alain., Bertin P., Elbaz-Poulichet F., Arsene-Ploetze F. (2011) Characterization of the Active Bacterial Community Involved in Natural Attenuation Processes in Arsenic-Rich Creek Sediments. Microbial Ecology 61(4), 793-810.

2010

M. Cotte; M. Auffan; W. Degruyter; I. Fairchild; M. A. Newton; G. Morin; G. Sarret; A. C. Scheinost (2010) Environmental Sciences at the ESRF. Synchrotron Radiation News 23(5), 28-35.

Egal M., Casiot C., Morin G., Elbaz-Poulichet F., Cordier M.A., Bruneel O. (2010) An updated insight into the natural attenuation of As concengtrations in Reigous creek (southern France). Applied Geochemistry 25(12), 1949-1957.

Blanchard M., Morin G., Lazzeri M., Balan E. (2010) First-principles study of the structural and isotopic properties of Al- and OH-bearing hematite. Geochimica et Cosmochimica Acta 74(14), 3948-3962.

Wang Y., Morin G., Ona-Nguema G., Juillot J., Guyot F., Calas G., Brown Jr. G.E. (2010) Evidence for Different Surface Speciation of Arsenite and Arsenate on Green Rust: an EXAFS and XANES study. Environmental Science and Technology  44, 109-115.

Ona-Nguema G. Morin G., Wang Y., Foster. A. Juillot F., Calas G., Brown Jr. G.E. (2010) XANES evidence for rapid Arsenic(III) Oxidation at Magnetite, and Ferrihydrite Surfaces by dissolved O2, via Fe2+-Mediated Reactions. Environmental Science and Technology 44 (14), 5416–5422.

Juhin A., Morin G., Elkaïm E., Frost D. J., Fialin M., Juillot F., Calas G. (2010) Structure refinement of a synthetic knorringite, Mg3(Cr0.8Mg0.1Si0.1)2(SiO4)3. American Mineralogist  95, 59–63.

Hohmann C., Winkler E., Morin G., Kappler A. (2010) Anaerobic Fe(II)-oxidizing bacteria show As resistance and immobilize As during Fe(III) mineral precipitation. Environmental Science and Technology  44, 94-101.

Ruby C, Abdelmoula M, Naille S, Renard A, Khare V, Ona-Nguema G, Morin G, Genin JMR. (2010) Oxidation modes and thermodynamics of FeII-III oxyhydroxycarbonate green rust: Dissolution-precipitation versus in situ deprotonation. Geochimica et Cosmochimica Acta 74(3), 953-966.

2009

Morin G., Wang Y., Ona-Nguema G., Juillot F., Calas G., Menguy M., Aubry E., Bargar J.R., Brown Jr. G.E. (2009) EXAFS and HRTEM Evidence for As(III)-Containing Surface Precipitates on Nanocrystalline Magnetite: Implications for As Sequestration. Langmuir 25, 9119-9128.

Ona-Nguema G., Morin G., Wang Y., Menguy N., Juillot F., Olivi L., Aquilanti G., Abdelmoula M., Ruby C., Bargar J.R., Guyot F., Calas G., Brown JR. G.E. (2009) Arsenite sequestration at the surface of nano-Fe(OH)2, ferrous-carbonate hydroxide, and green-rust after bioreduction of arsenic-sorbed lepidocrocite by Shewanella putrefaciens. Geochimica et Cosmochimica Acta 73, 1359-1381.

Miot, J.; Morin, G.; Skouri-Panet, F.; Férard, C.; Poitevin A.; Aubry, E.; Ona-Nguema G..; Juillot F. ; Guyot, F.; Brown, G. E. (2009) Speciation of Arsenic in Euglena gracilis Cells Exposed to As(V). Environmental Science and Technology 43, 3315-3321

Miot, J.; Benzerara K., Morin G., Kappler A., Bernard S., Obst M., Férard C., Skouri-Panet F., Guigner J-M., Posth N., Galvez M., Brown Jr. G.E., Guyot F. (2009) Iron biomineralization by anaerobic neutrophilic iron-oxidizing bacteria. Geochimica et Cosmochimica Acta 73, 696-711.

Miot J., Benzerara K., Morin G., Bernard S., Beyssac O, Larquet E., Kappler A., Guyot F. (2009) Transformation of vivianite by anaerobic nitrate-reducing iron-oxidizing bacteria. Geobiology 7, 373-384.

Miot J, Benzerara K, Obst M, Kappler A, Hegler F, Schädler S, Bouchez C, Guyot F, Morin G. (2009) Extracellular iron biomineralization by photoautotrophic iron-oxidizing bacteria. Appl Environ Microbiol. 75(17), 5586-5591.

Egal M., Casiot C., Morin G., Parmentier M., Bruneel O., Lebrun S., Elbaz-Poulichet F. (2009) Kinetic control on the formation of tooeleite, schwertmannite and jarosite by Acidithiobacillus ferrooxidans strains in an As(III)-rich acid mine water. Chemical Geology 265, 432-441.

Fandeur D, Juillot F, Morin G., Olivi L, Cognigni A., Ambrosi JP, Guyot F., Fritsch E. (2009) Synchrotron-based speciation of chromium in an Oxisol from New Caledonia: Importance of secondary Fe-oxyhydroxides. Amer. Mineral. 94, 710-719.

Fandeur D., Juillot F., Morin G., Olivi L, Cognigni A., Webb S.M., Ambrosi J-P., Fritsch E., Guyot F, Brown Jr. G.E. (2009) XANES evidence for oxidation of Cr(III) to Cr(VI)  by Mn-oxides in a lateritic regolith developed on serpentinized ultramafic rocks of New Caledonia. Environmental Science and Technology  43, 7384–7390.

Lahlil S., Bouquillon A., Morin G., Galoisy L., Lorre C. (2009) Relationship between the coloration and the firing technology used to produce Susa glazed ceramics of the end of the neolithic period. Archaeometry  51,  774-790.

Fakih M., Davranche M., Dia A., Nowack B., Morin G., Petitjean P., Châtellier X., Gruau G.(2009) Environmental impact of As(V)-Fe oxyhydroxide reductive dissolution: An experimental insight. Chemical Geology 259, 290-303.

2008

Juillot F., C. Maréchal, M. Ponthieu, S. Cacaly, G. Morin, M. Benedetti, J.L. Hazemann, O. Proux, F. Guyot. Zn isotopic fractionation caused by sorption on goethite and 2-Lines ferrihydrite. Geochimica et Cosmochimica Acta 72, 4886-4900.

Brown Jr. G.E., Wang, Y., Gelabert A., Ha, J., Cismasu C., Ona-Nguema G., Benzerara K., Miot J., Menguy N., Morin G., Juillot F., Guyot F., Calas G., Farges F., Trainor T., Gescher J., Cordova C., Spormann A.M. (2008) Synchrotron X-ray studies of heavy metal mineral-microbe interactions. Mineralogical Magazine 72, 169-173.

Morin G., Ona-Nguema G., Wang Y. Menguy N., Juillot F., Proux O., Guyot F., Calas G., Brown Jr. G.E. (2008) EXAFS analysis of arsenite and arsenate adsorption on maghemite. Environmental Science and Technology 42, 2361-2366.

Wang Y., Morin G., Ona-Nguema G., Menguy N., Juillot F., Aubry E., Guyot F., Calas G., Brown Jr. G.E.  (2008) Arsenite sorption at the magnetite-water interface during aqueous precipitation of magnetite. EXAFS evidence of a new surface complex. Geochimica et Cosmochimica Acta 72, 2573-2586.

Benzerara K., G. Morin, T.H. Yoon, J. Miot, T. Tyliszczak, C. Casiot, O. Bruneel, F. Farges, G.E. Brown Jr. (2008) Nanoscale study of As biomineralization in an acid mine drainage system. Geochimica et Cosmochimica Acta  72, 3949-3963.

Morin G., Ona-Nguema G., Wang Y. Menguy N., Juillot F., Proux O., Guyot F., Calas G., Brown JR. G.E. (2008) EXAFS analysis of arsenite and arsenate adsorption on maghemite. Environmental Science and Technology 42, 2361-2366.

Cancès B., Juillot F., Morin G., Laperche V., Polya D.,Vaughan D.J., Hazemann J.L., Proux O., Brown Jr. G. E. and Calas G. (2008) Change in arsenic speciation through a contaminated soil profile: a XAS based study. Science of the Total Environment 397, 178-189.

Miot, J.; Morin, G.; Skouri-Panet, F.; Férard, C.; Aubry, E.; Briand, J.; Wang, Y.; Ona-Nguema, G.; Guyot, F.; Brown, G. E. (2008) XAS Study of Arsenic Coordination in Euglena gracilis Exposed to Arsenite. Environ. Sci. Technol.; 2008; ASAP Article;  DOI: 10.1021/es703072d

Lahlil S, Biron I, Galoisy L, Morin G (2008) Rediscovering ancient glass technologies through the examination of opacifier crystals. Applied Physics A-Materials Science & Processing 92, 109-116.

2007

Burnol A., Garrido F., Baranger P., Joulian C., Dictor M-C., Bodenan F., Morin G. and Charlet L.(2007) Decoupling of arsenic and iron release from ferrihydrite suspension under reducing conditions: a biogeochemical model. Geochemical Transactions 8/1 :12, 1-55.

Morin G., Rousse G., Elkaim E. (2007) Crystal structure of tooeleite, a new iron arsenite hydroxysulfate relevant of acid mine drainage. American mineralogist 92, 193-197.

2006

Juillot F., Morin G., Ildefonse P., CalasG., and Brown, Jr. G.E. (2006) EXAFS signature of structural Zn at trace levels in natural and synthetic trioctahedral 2:1 phyllosilicates. American Mineralogist 91,1432-1441.

Morin G. and Calas G. (2006) Arsenic in soils, mine tailings, and former industrial sites. Elements 2 (2), 97-101.

Balan E., Lazzeri M., Morin G., Mauri  F. (2006) First-principles study of the OH stretching modes of gibbsite. American Mineralogist 91, 115-119.

Farges, F., Siewert, R., Brown, G.E., Jr., Guesdon, A., Morin, G. (2006) Structural environment around molybdenum in silicate glasses and melts: Part I. Influence of composition and oxygen fugacity on the local structure of molybdenum. Canadian Mineralogist 44, 731-753.

2005

Cancès B., Juillot F., Morin G., Laperche V., Alvarez L., Proux O., Hazemann J-L, Brown Jr. G.E., Calas G. (2005) XAS evidence of As(V) association with iron oxyhydroxides in a contaminated soil at a former arsenical pesticide processing plant. Environmental Science and Technology 39, 9398-9405.

Ona-Nguema G., Morin G., Juillot F., Brown JR. G.E., Calas G. (2005) EXAFS analysis of Arsenic(III) sorption onto 2-line ferrihydrite, hematite, gœthite, and lepidocrocite under anoxic conditions. Environmental Science and Technology 39, 9147-9155.

Fritsch E., Morin G., Bedidi A., Bonnin D., Balan E., Caquineau S., Calas G. (2005). Transformation of haematite and Al-poor goethite to Al-rich goethite and associated yellowing in a ferralitic clay soil profile of the middle Amazon basin (Manaus, Brazil). European Journal of Soil Science 56/5, 575-588.

Casiot C., Lebrun S., Morin G., Bruneel O., Personné J.C. and Elbaz-Poulichet F. (2005) Sorption and redox processes controlling arsenic fate and transport in a stream impacted by acid mine drainage.  Science of The Total Environment, 347, 122-130.

Sorieul S., Allard T., Morin G., Boizot B., Calas G. (2005) Native and artificial radiation-induced defects in montmorillonite. An EPR study. Physics and Chemistry of Minerals 32, 1-7.

2004

Barbosa E.M., Varajao A.F.D.C, Yvon J., Allard T., Balan E., Morin G. and Abdelmoula M. (2004). Iron EPR logging as a tool for stratigraphic determinations : Application to Rio Capim kaolin deposit (Brazil). Journal of Mining and Metallurgy 40A (1), 1- 9.

2003

Morin G., Juillot F., Casiot C., Bruneel O., Personné J-C., Elbaz-Poulichet F., Leblanc M., Ildefonse Ph., Calas G. (2003) Bacterial formation of tooeleite and mixed arsenic(III) or arsenic(V)-iron(III) gels in the Carnoulès acid mine drainage, France. A XANES, XRD and SEM study. Environmental Science and Technology 37, 1705-1712. pdf

Casiot C., Morin G., Juillot F., Bruneel O., Personné J.C., Leblanc M., Duquesne K., Bonnefoy V., Elbaz-Poulichet F. (2003) Bacterial immobilisation and oxidation of arsenic in acid mine drainage (Carnoulès creek, France). Water Research 37, 2929-2936. pdf

Duquesne K., Lebrun S., Casiot C., Bruneel O., Personné J-C., Leblanc M., Elbaz-Poulichet F., Morin G. and Bonnefoy V. (2003) Immobilization of arsenite and ferric iron by Acidithiobacillus ferrooxidans and its relevance to acid mine drainage. Applied Environmental Microbiology 69/10, 6165-6173. abstract

Juillot F., Morin G., Ildefonse Ph., Trainor T., Benedetti M., Galoisy L., Calas G. and Brown Jr. G.E., (2003) Occurrence of Zn/Al Hydrotalcite in Smelter-Impacted Soils from Northern France: Evidence from EXAFS Spectroscopy and Chemical Extractions. American Mineralogist 88, 509-526. abstract

Reiche I., Morin G., Brouder C., Solé A., Petit P-E., Vignaud C., Calligaro T., Menu M. (2003) Manganese accommodation in fossilised mastodon ivory and heat-induced colour transformation: Evidence by EXAFS. European Journal of Mineralogy 14/6, 1069-1073. abstract

2002

Morin G., Ildefonse Ph., Balan E., Allard T. and Calas G. (2002) Native Cd+ in sedimentary fluorapatite. European Journal of Mineralogy14/6, 1087-1094. abstract

Morin G., Lecocq D., Juillot F., Calas G. and  Ildefonse P. (2002) EXAFS evidence of sorbed arsenic(V) and pharmacosiderite in a soil overlying the Echassieres geochemical anomaly, Allier, France. Bulletin de la Société Géologique de France 173, 281-291.

Reiche I., Morin G., Brouder C., Solé A., Petit P-E., Vignaud C., Calligaro T., Menu M. (2003) Manganese accommodation in fossilised mastodon ivory and heat-induced colour transformation: Evidence by EXAFS. European Journal of Mineralogy 14/6, 1069-1073.

Balan E., Allard T., Morin G. and Calas G. (2002) Incorporation of Cr3+ in dickite : a spectroscopic study. Physics and Chemistry of Minerals 29, 273-279.

2001

Morin G., Juillot F., Ildefonse Ph., Samama J.-C., Brown G.E. Jr., Chevallier P. and Calas G.,  (2001) Mineralogy of lead in a Pb-mineralized sandstone (Ardèche, France) American Mineralogist  86, 92-104. pdf

Reiche  I., Vignaud C., Champagnon B., Panczer G., Brouder C., Morin G., Solé A., Charlet L., and Menu M. (2001) From Mastodon ivory to gemstone : the origin of turquoise color in odontolite. American Mineralogist 86, 1519-1524. pdf ESRF Highlight

Dumat C., Chiquet A., Goody D., Aubry E., Morin G., Juillot F. and Benedetti M. F. (2001) Metal ion geochemistry in smelter impacted soils and soil solutions. Bulletin de la Société Géologique de France 172, 539-548.

Djemai A., Balan E., Morin G., Hernandez G., Labbe J.-C., Muller J.-P. (2001) Behavior of paramagnetic iron during the thermal transformations of Kaolinite, Journal of American Ceramic Society 84, 1017-1024.

2000

Balan E., Allard T., Boizot B., Morin G. and Muller J.P. (2000) Quantitative measurement of paramagnetic Fe3+ in kaolinite. Clays and Clay Minerals  48, 439-445.

1999

Balan E., Allard T., Boizot B., Morin G. and Muller J.P. (1999) Structural Fe3+ in natural kaolinites : New insights from Electron Paramagnetic Resonance spectra fitting at X and Q-band frequencies. Clays and Clay Minerals 47, 605-616

Rossano S., Balan E., Morin G., Bauer J.-P., Calas G. and Brouder Ch. (1999) 57Fe Mössbauer spectroscopy of tektites. Physics and Chemistry of Minerals 26, 530-538 

Juillot F., Ildefonse Ph., Morin G., Calas G., De Kersabiec A.M. and Benedetti M. (1999) Remobilisation of arsenic from buried wastes in an industrial site: mineralogical and geochemical control. Applied Geochemistry 14, 1031-1048.

Morin G. and Bonnin D. (1999) Modeling EPR powder spectra using numerical diagonalization of the spin hamiltonian. Journal of Magnetic Resonance  136, 176-199.

Morin G., Ostergren J., Juillot F., Ildefonse Ph., Calas G. and Brown G.E. Jr. (1999) XAFS determination of the chemical form of lead in smelter-contaminated soils and mine tailings: Importance of sorption processes. American Mineralogist  84, 420-434.  pdf

1998

Galoisy L., Calas G., Morin G., Pugnet S. and Fillet C. (1998) Structure of Pd-Te precipitates in a simulated high-level nuclear waste glass. Journal of Material Research 13, 1124-1127.

Galoisy L., Delaye J.M., Ghaleb D., Calas G., Le Grand M., Morin G., Ramos A. and Pacaud F. (1998) Local structure of simplified waste glass: complementarity of XAS and MD calculations. Nuclear Waste Management 21, 133-140.

Pomies M.P., Morin G. and Vignaud C. (1998) XRD Study of the goethite-hematite transformation: application to the identification of heated prehistoric pigments. European  Journal of Solid State Inorganic  Chemistry 35, 9-25.

1994-1997

Allard T., Calas G., Ildefonse Ph., Morin G. and Muller J.P. (1997) Impuretés et défauts dans les minéraux de basse température : des témoins de leur histoire. (Impurities and defects in low temperature mineral components : tracers of their history)., Comptes rendus de l'Academie des Sciences: Sciences de la Terre 325, 1-10.

Michel V., Ildefonse Ph. and Morin G. (1996) Assessment of archeological bone and dentine preservation from a Middle Pleistocene site. Palaeogeography Palaeoclimatology Palaeoecology 126, 109-119.

Michel V., Ildefonse Ph. and Morin G. (1995) Chemical and structural changes in Cervus elaphus  tooth enamel during fossilization  (Lazaret cave): a combined IR and XRD Rietveld analysis. Applied Geochemistry  10, 145-159.

Goffe, B., Baronnet, A. and Morin G. (1994) La saliotite, interstratifié ordonné 1:1 cookéite/paragonite. Nouveau phyllosilicate du métamorphisme de haute pression basse température. European Journal of Mineralogy  6, 897-911

Conférences Invitées

In-situ arsenic speciation in earth surface environments: importance of iron oxides. Goldschmidt Conference, Cologne, August 2007.

Arsenic Speciation in Soils and Aquifers: Role of Iron Oxides. 3rd Annual Meeting of the Stanford Environmental Molecular Science Institute. August 13-14, 2007.

Arsenic in soils, mine tailing and former industrial sites. 20th General Meeting International Mineralogical Association,Kobe, Juillet 2006.

XAS monitoring of Arsenic (Bio-)Oxidation and Immobilisation in Soils and Acid Mine Drainage. Goldschmidt Conference, Davos, Septembre 2002.

Molecular-level speciation of lead and arsenic in soils over geochemical anomalies. EUG 11, Strasbourg, 2001.



Séminaires invités

Crystal-chemistry of lead and arsenic in soils and acid mine drainage, ETH Zürich, Suisse, mai 2007.

Arsenic speciation in soils and aquifers: role of iron oxides, Université de Tuebingen, Allemagne, mai 2008.

Mobilité de l'arsenic dans les sols et les eaux : Contrôles minéralogiques et microbiens. Séminaires Généraux de l’Institut de Physique du Globe de Paris, oct. 2008. http://www.ipgp.jussieu.fr/pages/040805.php?name=20081002
 
Matériaux, minéraux et environnement : les informations données par les rayons X. Réunion annuelle des utilisateurs Panalytical, Paris, Mai 2006.

Cristallochimie de l’arsenic et mesures directes de sa spéciation. Etude comparée de différents sites. Journées d'étude sur l'arsenic en milieu minier, Société de l'Industrie Minérale, Narbonne, Septembre 2000.

La spectrométrie RPE. Réunion "Méthodes analytiques en Minéralogie", SFMC, Paris, Mai 2000

Evidences directes du piégeage des métaux par des matières organiques dans les sols et les eaux. Colloque IHSS3, INRA-Versailles, 3-4 juin 1999.

Intégration des différentes méthodes d'étude de la spéciation des métaux lourds : exemple des sols d'Evin (Pas-de-Calais). Réunion "Spéciation des métaux  dans les sols", Club CRIN, Paris, Mai 1998


Spectroscopie RPE des éléments de transition. galerne 94, Le Hohwald, Octobre 1994.

proceedings

Brown, G.E., Jr., Kendelewicz, T., Trainor, T.P., Tanwar, K.S., Chaka, A.M., Bluhm, H., Starr, D.E., Yamamoto, S., Nilsson, A., Catalano, J.G., Benzerara, K., Yoon, T.H., Morin, G., Ona−Nguema, G., Juillot, F., Cances, B., and Calas, G., (2007) Recent advances in surface, interface, and environmental geochemistry. In: Water−Rock Interaction−12, Proc. 12th Internat. Water−Rock Interaction−12, Proceedings of the 12th International Water−Rock Interaction Conference, Kunming, China (Thomas Bullen and Yanxin Wang, eds.), Taylor & Francis Publishers, London, Vol. 1, pp. 3−11.

Juillot, F., Morin, G., Hazemann, J-L., Proux, O., Belin, S., Briois, V., Brown, G.E., Jr., and Calas, G. (2007) EXAFS signatures of structural Zn at trace levels in layered minerals. Am. Inst. Phys. Conf. Proc., 13th Int. XAFS Conf. 882, 247-249.

Brown, Jr. G.E., A. Nilsson, A.M. Spormann, W. P. Addiego, K. Benzerara, U. Bergmann, H. Bluhm, B. A. Brown, G. Calas, A.M. Chaka, B.R. Constantz, F. Farges, S. E. Fendorf, A.L. Foster, F. Juillot, G. Morin, S.C.B. M, L.G.M. Pettersson, K.M. Rosso, J.J. Rytuba, M. Salmeron, J. Saltzman, M. Toney, T.P. Trainor, and T. Yoon (2006) The Stanford Environmental Molecular Science Institute – A Focus on Chemical and Microbial Processes at Environmental Interfaces.  Geochemical News 128, 7-30.

Brown G.E. Jr, J. G.  Catalano, A. S.  Templeton, T. P.  Trainor, F.  Farges, B. C.  Bostick, T. Kendelewicz, C. S.  Doyle, A. M.  Spormann, K. Revill, G.  Morin, F. Juillot, G. Calas (2005) Environmental Interfaces, Heavy Metals, Microbes, and Plants Applications of XAFS Spectroscopy and Related Synchrotron Radiation Methods to Environmental Science. Proceedings of the XAFS 12 conference, Malmö, Sweden, Physica Scripta, T115, 80-87.

Reiche I., G. Morin, Ch. Brouder, C. Vignaud, M. Menu (2005) The history of a turquoise imitation - odontolite- a combined elemental, structural and spectroscopic study, Proceedings of the 33rd International Symposium on Archaeometry, Amsterdam, 22-26 April 2002, H. Kars and E. Burke Eds., Geoarchaeological and Bioarchaeological Studies  3, 509-513.

Calas G., Allard T., Balan E., Morin G., Sorieul S. (2004) Radiation Induced Defects In Nonradioactive Natural Minerals: Mineralogical And Environmental Significance. Material Research Proceedings Symposium. 792, R2.6.1- 12.

Reiche  I., Vignaud C., Champagnon B., Panczer G., Brouder C., Morin G., Solé A., Charlet L., and Menu M. (2002) From Mastodon ivory to gemstone. ESRF Highlights 2001, 31-32.

Ildefonse Ph. Morin G., Juillot F., Calas G., Samama J.C., Brown Jr. G.E., Chevallier P., Populus P. (1999) Weathering of a Pb-Mineralized sandstone, Ardèche, France: Lead speciation. Proc. 5th Int. Symp. Geochemistry of the Earth’s Surface, Reykjavik/Iceland, 16-20 August 1999, Balkema, 385-388.

Galoisy L, Calas G., Ramos A., Le Grand M., Allard T., Morin G., Fillet C. and Pacaud F. (1998) Evolution of the structure of simulated nuclear glasses with the introduction of noble metals. in "Le verre: recherche scientifique pour un confinement de haute performance", Actes de l'Université d'Eté du CEA/Valrho, p 59-64.

Calas G. et Morin G. (1994) Résonance paramagnétique des ions de métaux de transition, post-transition et lanthanides. In: Spectroscopies de résonances paramagnétiques électroniques: du cristal à l'amorphe, de l'isolant au conducteur, D. Gourier et F. Taulelle, Eds, Proceeding, GALERNE 94, Mt St Odile, 9-14 octobre 94 . pp 48.

Morin G., Ildefonse P., Bonnin D., Bouzat G. (1992) A quantitative Rietveld and Mössbauer analysis of aluminium deposits: example from Guinea. Proceedings of the 7th International symposium on Water-Rock Interaction, Park City, Utah, USA. 13 - 19 july 1992,  2, 167-172.

Research fields

Bio-geo-chemistry of minor (Fe, Mn) and trace elements (As, Pb, Zn) in soils and sediments

Chemical speciation (oxidation state, molecular environment) is a key parameter controlling the mobility, toxicity, and bioavailability of chemical elements in surface waters, aquifers, soils and sediments. This parameter directly depends on interactions between solute species, mineral surfaces, organic and biologic substances within heterogeneous natural systems.
We have quantitatively determined chemical species of environmentally relevant minor and trace elements using solid state physics methods (XRD, XAS). The spatial distribution of these chemical species has been integrated on various scales, from the landscape (geochemical budgets) to the soil microstructures (µSXRF, MEB, electron-microprobe, TEM).
Our work has addressed contaminated systems (smelter impacted soils, sewage sludge contaminated soils, acid drainage) and natural geochemical anomalies, in order to compare mechanisms of trace elements immobilization at short and long term, respectively. Combining spectroscopic, mineralogical, geochemical, microbiological data, collected thanks to integrated research programs, allowed us to find evidences of recurrent sinking mechanisms for lead, zinc and arsenic in soils and surface waters. Such information crucial for predicting the fate of these trace elements at the Earth's surface.
More recently we investigated in the field and at the laboratory, the role of microorganisms on the formation and evolution of iron minerals, in relation with the sinking of associated trace elements, at redox interfaces, e.g. acid mine drainage and oxic-anoxic transitions in soils and sediments.


      Lead in polluted soils from Nord Pas-de-Calais, France
     
         
   
Direct evidence of the importance of adsorption processes in soils. We have conducted a mineralogical investigation of smelter-contaminated soils from Evin-Malmaison, Nord-Pas-de-Calais, France.  Bulk Pb concentrations range from 460 to 1900 ppm in the topsoils. These concentrations necessarily raise human health and environmental concerns, but bioavailability and chemical lability of Pb in these materials vary dramatically and show little correlation with bulk concentrations. Our study provides detailed information on the speciation of Pb in these materials. We emphasize the identification and characterization of poorly crystalline and/or fine-grained species, such as sorption complexes and poorly crystalline (co)precipitates, which are likely to control Pb bioavailability and mobility in these natural systems. Because these samples are heterogeneous, multi-phase mixtures, a variety of bulk analytical methods were employed, including powder x-ray diffraction and Rietveld refinement, scanning electron microscopy, electron probe microanalysis, and synchrotron-based x-ray absorption and micro-fluorescence spectroscopies. The synchrotron-based techniques enabled identification of amorphous or nanocrystalline Pb-containing phases, and the spatial distribution of Pb at the 25 µm scale. Applying these techniques in conjunction with physical and chemical separation techniques, we are able to identify and characterize a number of species not amenable to detection by conventional microanalytical techniques. We find direct spectroscopic evidence for Pb sorbed to humic acids, as well as to both manganese and iron (oxyhydr)oxides. These various sinking mechanisms may account for the weak mobility of lead in both soils. (From Morin et al. American Mineralogist 1999)


             Arsenic in soils over geochemical anomalies, Echassières, Allier, France


Arsenic sorption on iron oxides as an ultimate sink for arsenic after long term weathering. Changes in arsenic speciation in a soil profile developed on FeAsS and FeAs2 mineralized schists in the Echassières region, Allier, France. Concentrations of As, Cu, and Zn indicate some enrichment relative to the bedrock in the upper part of the saprolite (B and C1 horizons) and a progressive depletion towards surficial A2–A00 horizons. SEM photograph displaying the typical euhedral cubic crystals of pharmacosiderite (Ph) formed after hydrothermal weathering of primary iron–arsenic sulfides minerals. XRD patterns show the progressive disappearance of this crystalline towards the upper part of the saprolite; the main Bragg reflections of muscovite (Mu) and biotite (Bt) are also indicated. Fourier filtered contributions of the second neighbor contributions to the EXAFS spectra  at As K-edge indicate that As is adsorbed on HFO in topsoils horizons. Modified from Morin et al. (2002)


Arsenic in acid mine drainage

The key role of microorganisms in immobilizing arsenic in acid mine drainage. Massive bacterial oxidation of iron and arsenic leads to the formation of spectacular outcrops of arsenic-bearing (up to 20 wt% As) sediments and meter-wide stromatolites (bottom center) at the Carnoulès (Gard, France) acid mine drainage. The proportion of seasonally alternating As(III) and As(V) species associated with ferric oxides can be quantified by XANES spectroscopy (right). SEM  micrograph of winter sediments (top right) shows the close association between Acidithiobacillus ferrooxydans, which oxidizes only Fe(II), and a Fe(III)-arsenite, tooeleite (Morin et al. Amer Mineral 2007). This rare mineral, with a distinctive layer structure (top center) is the main component of the stromatolite (bottom left). from Morin & Calas, Elements (2006)


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