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Garrison Sposito Betty and Isaac Barshad Chair in
Soil Science Office: 117B
Hilgard Hall |
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Garrison Sposito Betty and Isaac Barshad Chair in
Soil Science Office: 117B
Hilgard Hall |
Education
B.S. Agriculture 1961 University of Arizona
M.S. Soil Physics 1963 University of Arizona
Ph.D. Soil Science 1965 University of California at Berkeley
Professor Sposito teaches courses on physical chemistry applied to natural aqueous systems, particularly soils and aquifers, including an undergraduate course on environmental aqueous geochemistry and a graduate course on the surface and colloid chemistry of natural particles. He also teaches an undergraduate course, Introduction to Environmental Studies, with English professor Robert Hass.
Aqueous geochemistry, especially surface chemistry and colloidal behavior; mathematical models of transport in porous media; molecular simulations of geochemical systems.
Sposito, G. 2001. Topological groundwater hydrodynamics. Advan. Water Resour. 24:793.Sposito, G. 2001. Methods of quantum field theory in the physics of subsurface solute transport. Transp. Porous Media 42:181.
Sutton, R., and G. Sposito. 2001. Molecular simulation of interlayer structure and dynamics in 12.4 Å Cs-smectite hydrates. J. Colloid Interface Sci. 237:174.
Cocozza, C., C.C.G. Tsao, S.-F. Cheah, S.M. Kraemer, K.N. Raymond, T.M. Miano, and G. Sposito. 2002. Temperature dependence of goethite dissolution promoted by trihydroxamate siderophores. Geochim. Cosmochim. Acta 66:431.
Kraemer, S.M., J. Xu, K.N. Raymond, and G. Sposito. 2002. Adsorption of Pb(II) and Eu(III) by oxide minerals in the presence of natural and synthetic hydroxamate siderophores. Environ. Sci. Technol. 36:1287.
Park, S.-H., and G. Sposito. 2002. Structure of water adsorbed on a mica surface. Phys. Rev. Lett. 89:85501.
Lo, W.-C., G. Sposito, and E.L. Majer. 2002. Immiscible two-phase fluid flows in deformable porous media. Advan. Water Resour. 25:1105.
Sutton, R., and G. Sposito. 2002. Animated molecular dynamics simulations of hydrated caesium-smectite interlayers. Geochem. Trans. 3:73.
Manceau, A., N. Tamura, M. A. Marcus, A. A. MacDowell, R. S. Celestre, R. E. Sublett, G. Sposito and H. A. Padmore. 2002. Deciphering Ni sequestration in soil ferromanganese nodules by combining X-ray fluorescence, absorption, and diffraction at micrometer scales of resolution. Amer. Miner. 87:1494.
Manceau, A., N. Tamura, R. S. Celestre, A. A. MacDowell, N. Geoffroy, G. Sposito, and H. A. Padmore. 2003. Molecular-scale speciation of Zn and Ni in soil ferromanganese nodules from loess soils of the Mississippi Basin. Environ. Sci. Technol. 37:75.
Cheah, S.-F., S. M. Kraemer, J. Cervini-Silva, and G. Sposito. 2003. Steady-state dissolution kinetics of goethite in the presence of desferrioxamine B and oxalate ligands: Implications for microbial acquisition of iron. Chem. Geol. 198:63.
Villalobos, M., B. Toner, J. Bargar, and G. Sposito. 2003. Characterization of the manganese oxide produced by Pseudomonas putida strain MnB1. Geochim. Cosmochim. Acta 67:2649.
Refson, K., S.-H. Park, and G. Sposito. 2003. Ab initio computational crystallography of 2:1 clay minerals: 1. Pyrophyllite-1Tc. J. Phys. Chem. B 107:13,376.
Bourg, I.C., A.C.M. Bourg, and G. Sposito. 2003. Modeling diffusion and adsorption in compacted bentonite: A critical review. J. Contam. Hydrol. 61:293.
Sposito, G. 2004. The Surface Chemistry of Natural Particles. Oxford University Press, New York. 242 p.
Park, S.-H. and G. Sposito. 2004. Molecular modeling of clay structure and surface chemistry. In S.A. Auerbach, K.A. Carrado, and P.K. Dutta (eds.), Handbook of Layered Materials Science & Technology, Chap. 2. Marcel Dekker, New York.
Sposito, G. 2004. Scaling of Soil Physical Properties and Processes. In D. Hillel (ed.), Encyclopedia of Soils in the Environment, pp. 472-476. Elsevier, San Diego.
Parker, D.L., G. Sposito, and B.M. Tebo. 2004. Manganese (III) binding to a pyoverdine siderophore produced by a manganese (II)-oxidizing bacterium. Geochim. Cosmochim. Acta 68:4809.
Toner, B.M., S. Fakra, M. Villalobos, T. Warwick, and G. Sposito. 2005. Spatially resolved characterization of biogenic manganese oxide production within a bacterial biofilm. Appl. Environ. Microbiol. 71:1300.
Villalobos, M., J. Bargar, and G. Sposito. 2005. Mechanisms of Pb(II) sorption on a biogenic manganese oxide. Environ. Sci Technol. 39:569.
Lo, W.-C., G. Sposito, and E. Majer. 2005. Wave propagation through elastic porous media containing two immiscible fluids. Water Resour. Res. 41(2):W02025 (20pp.).
Toner, B., and G. Sposito. 2005. Reductive dissolution of biogenic manganese oxides in the presence of a hydrated biofilm. Geomicrobiol. J. 22:171.
Dubbin, W.E. and G. Sposito. 2005. Copper-glyphosate sorption to microcrystalline gibbsite in the presence of soluble Keggin Al13 polymers. Environ. Sci Technol. 39:2509.
Sutton, R., G. Sposito, M.S. Diallo, and H.-R. Schulten. 2005. Molecular simulation of a model of dissolved organic matter. Environ. Toxicol. Chem. 24: 1902.
Peretyazhko, T. and G. Sposito. 2005. Iron(III) reduction and phosphorus solubilization in humid tropical forest soils. Geochim. Cosmochim. Acta 69:3643.
Duckworth, O.W. and G. Sposito. 2005. Siderophore-manganese(III) interactions. I. Air-oxidation of manganese(II) promoted by Desferrioxamine B. Environ. Sci. Technol. 69:6037.
Duckworth, O.W. and G. Sposito. 2005. Siderophore-manganese(III) interactions. II. Manganite dissolution promoted by Desferrioxamine B. Environ. Sci. Technol. 69:6045.
Toner, B., A. Manceau, M. A. Marcus, D. B. Millet, and G. Sposito. 2005. Zinc sorption by a bacterial biofilm. Environ. Sci. Technol. 39:8288.
Sutton, R. and G. Sposito. 2005. Molecular structure in soil humic substances: The new view. Environ. Sci. Technol. 39:9009.
Villalobos, M., J. Bargar, and G. Sposito. 2005. Trace metal retention on biogenic manganese oxide nanoparticles. Elements 1:223.
Lo, W.-C., G. Sposito, and E. Majer. 2006. Low-frequency dilatational wave propagation through fully-saturated porous media. Advan. Water Resour. 29:408.
Sposito, G. 2006. Chaotic solute advection by unsteady groundwater flow. Water Resour. Res. 42:W06D03, doi:10.1029/2005WR004518 (6 pp.).
Toner, B., A. Manceau, S. M. Webb, and G. Sposito. 2006. Zinc sorption by biogenic hexagonal birnessite particles within a hydrated biofilm. Geochim. Cosmochim. Acta 70:27.
Villalobos, M., B. Lanson, A. Manceau, B. Toner, and G. Sposito. 2006. Structural model for the biogenic Mn oxide produced by Pseudomonas putida. Am. Miner. 91:489.
Bourg, I. C., G. Sposito, and A. C. M. Bourg. 2006. Tracer diffusion in compacted water-saturated bentonite. Clays Clay Miner. 54:363.
Sutton, R. and G. Sposito. 2006. Molecular simulation of humic substance-Ca-montmorillonite complexes. Geochim. Cosmochim. Acta 70:3566.
Peretyazhko, T. and G. Sposito. 2006. Reducing capacity of terrestrial humic acids. Geoderma 137:140.
Lo, W.-C., G. Sposito, and E. Majer. 2007. Low-frequency dilatational wave propagation through unsaturated porous media containing two immiscible fluids. Transport Porous Media 68:91.
Bourg, I. C., G. Sposito, and A. C. M. Bourg. 2007. Modeling the acid-base surface chemistry of montmorillonite. J. Colloid Interface Sci. 312:297.
Duckworth, O. W. and G. Sposito. 2007. Siderophore-promoted dissolution of synthetic and biogenic layer type Mn oxides. Chem. Geol. 242:500.
Bourg, I. C. and G. Sposito. 2007. Molecular dynamics simulations of kinetic isotope fractionation during the diffusion of ionic species in water. Geochim. Cosmochim. Acta 71:5583.
Bourg, I. C., G. Sposito, and A. C. M. Bourg. 2007. Modeling cation diffusion in compacted water-saturated sodium bentonite at low ionic strength. Environ. Sci. Technol. 41:8118.
Peña, J., O. W. Duckworth, J. R. Bargar, and G. Sposito. 2007. Dissolution of hausmannite (Mn3O4) in the presence of the trihydroxamate siderophore desferrioxamine B. Geochim. Cosmochim. Acta 71:5661.
Sposito, G. 2008. Geochemistry in Soil Science. In W. Chesworth (ed.), Encyclopedia of Soil Science, pp. 283-289. Springer, New York.
Sposito, G. 2008. The Chemistry of Soils. 2nd Ed. Oxford University Press, New York. 330 p.
Kwon, K. D., K. Refson, and G. Sposito. 2008. Defect-induced photoconductivity in layered manganese oxides: A density functional theory study. Phys. Rev. Lett. 100:146601 (4 pp).
Bourg, I. C., and G. Sposito. 2008. Isotopic fractionation of noble gases by diffusion in liquid water. Geochim. Cosmochim. Acta. 72:2237.
Bourg, I. C., G. Sposito, and A. C. M. Bourg. 2008. Modeling the diffusion of Na+ in compacted water-saturated Na-bentonite as a function of pore water ionic strength. Appl. Geochem. 23:3635.
Duckworth, O. W., J. R. Bargar, and G. Sposito. 2008. Sorption of ferric iron from ferrioxamine B to synthetic and biogenic layer type manganese oxides. Geochim. Cosmochim. Acta 72:3371.
Aristilde, L., and G. Sposito. 2008. Molecular modeling of metal complexation by a fluoroquinolone antibiotic. Environ. Toxicol. Chem. 27:2304.
Rakshit, S., M. Uchimiya, and G. Sposito. 2009. Iron(III) bioreduction in soil in the presence of added humic substances. Soil Sci. Soc. Am. J. 73:65.
Duckworth, O. W., S. J. M. Holmström, J. Peña, and G. Sposito. 2009. Biogeochemistry of iron oxidation in a circumneutral freshwater habitat. Chem. Geol. 260:149.
Lo, W.-C., G. Sposito, and E. Majer. 2009. Analytical decoupling of poroelasticity equations for acoustic wave propagation and attenuation in a porous medium containing two immiscible fluids. J. Engin. Math. 64:219.
Duckworth, O. W., J. Bargar, and G. Sposito. 2009. Quantitative structure-activity relationships for aqueous metal-siderophore complexes. Environ. Sci. Technol. 43:343.
Kwon, K. D., K. Refson, and G. Sposito. 2009. Zinc surface complexes on birnessite: A density functional theory study. Geochim. Cosmochim. Acta 73:1273.
Duckworth, O. W., J. R. Bargar, A. A. Jarzecki, O. Oyerinde, T. G. Spiro, and G. Sposito. 2009. The exceptionally stable Co(III)-desferrioxamine B complex. Marine Chem. 113:114.
Duckworth, O. W., J. Bargar, and G. Sposito. 2009. Coupled biogeochemical cycling of iron and manganese as mediated by microbial siderophores. Biometals 22:605.
Kwon, K.D., K. Refson, and G. Sposito. 2009. On the role of Mn(IV) vacancies in the photoreductive dissolution of hexagonal birnessite. Geochim. Cosmochim. Acta 73:3981.
Spiro, T. G., J. R. Bargar, G. Sposito, and B. M. Tebo. 2010. Bacteriogenic manganese oxides. Acc. Chem. Res. 43:2.
Aristilde, L., and G. Sposito. 2010. Binding of Ciprofloxacin by humic substances: A molecular dynamics study. Environ. Toxicol. Chem. 44:1444.
Aristilde, L., L. Melis, and G. Sposito. 2010. Inhibition of photosynthesis by a fluoroquinolone antibiotic. Environ. Sci. Technol. 44:1444.
Lo, W.-C., G. Sposito, E. Majer, and C.-L. Yeh. 2010. Motional modes of dilatational waves in elastic porous media containing two immiscible fluids. Advan. Water Resour. 33:304.
Bourg, I. C., F. M. Richter, J. N. Christensen, and G. Sposito. 2010. Isotopic mass-dependence of metal cation diffusion coefficients in liquid water. Geochem. Cosmochim. Acta 74:2249.
Bourg, I. C., and G. Sposito. 2010. Connecting the molecular scale to the continuum scale for diffusion processes in smectite-rich porous media. Environ. Sci. Technol. 44:2085.
Peña, J., K. D. Kwon, K. Refson, J. R. Bargar, and G. Sposito. 2010. Mechanisms of nickel sorption by a bacteriogenic birnessite. Geochem. Cosmochim. Acta 74:3076.
Kwon, K. D., and G. Sposito. 2010. Reactivity of biogenic manganese oxide for metal sequestration and photochemistry: Computational solid state physics study. J. Miner. Soc. Korea 23:161. (in Korean)
Kwon, K. D., K. Refson, and G. Sposito. 2010. Surface complexation of Pb(II) by hexagonal birnessite nanoparticles. Geochem. Cosmochim. Acta 74:6731.
Kwon, K. D., K. Refson, S. Bone, R. Qiao, W. Yang, Z. Liu, and G. Sposito. 2011. Magnetic ordering in mackinawite (tetragonal FeS): Evidence for strong itinerant spin fluctuations. Phys. Rev. B. 83:064402.
Bourg, I., and G. Sposito. 2011. Molecular dynamics simulations of the electrical double layer on smectite surfaces contacting concentrated mixed electrolyte (NaCl-CaCl2) solutions. J. Colloid Interface Sci. 360:701.
Bourg, I. C. and G. Sposito. 2011. Ion Exchange Phenomena. In M.E. Sumner (ed.), Handbook of Soil Science, Section B, Chap. 6. CRC Press, Boca Raton, FL.
Sposito, G. 2011. Electron shuttling by natural organic matter: Twenty years after. In P. Tratnyek, T. Grundl, and S. Haderlein (eds.), Aquatic Redox Chemistry, Chap. 5. ACS Symposium Series, American Chemical Society, Washington, DC.
Senior Fulbright Lecturer in Theoretical Solid-State Physics (University of Córdoba, Argentina)
Guggenheim Fellow (Applied Mathematics, University of Oxford)
NATO-Heinemann Senior Fellow (Chemistry, National Institute of Agronomic Research, Versailles, France)
Fellow: American Geophysical Union, American Society of Agronomy, European Association of Geochemistry, Geochemical Society, International Union of Pure and Applied Chemistry, and Soil Science Society of America
Soil Science Research Award, Soil Science Society of America
Hydrology Section Research Award, American Geophysical Union
Distinguished Teaching Award, Sonoma State University
Distinguished Teaching Award, University of California at Riverside
Distinguished Teaching Award, College of Natural Resources, University of California at Berkeley
Teaching Excellence Laureate, Phi Beta Kappa
Faculty Award for Outstanding Mentoring of GSIs, University of California at Berkeley
Miller Research Professor, University of California at Berkeley
Foreign Member, Academy of Agriculture of France
"Landmark" Paper Award, Association of Environmental Engineering and Science Professors
Walter J. Weber, Jr. Distinguished Lecture in Environmental Sciences and Engineering, University of Michigan
Highly-cited Researcher, Ecology and Environment, Institute for Scientific Information
Horton Medal, American Geophysical Union
"Physical Chemistry of Soils and Aquifers," Special Symposium of the American Chemical Society and Special Issue of Geochimica et Cosmochimica Acta (656 KB Adobe PDF)
Designated a "Legend of Environmental Chemistry," American Chemical Society (95 KB Adobe PDF)
Hans Jenny Memorial Lecture in Soil Science, University of California at Berkeley
Soils are open, multicomponent, biogeochemical systems containing solids, liquids, and gases. That they are open systems means soils exchange both matter and energy with the surrounding atmosphere, biosphere, and hydrosphere. These flows of matter and energy to or from soils are highly variable in time and space, but they are the essential fluxes that cause the development of soil profiles and govern the patterns of soil quality. These remarkable earth materials are discussed for the non-specialist reader in G. Sposito, "Soil," Encyclopaedia Britannica Online.
Research in aqueous geochemistry has long benefited from insights provided by molecular simulations. The underlying philosophy of these simulations is to construct a mathematical description of molecular interactions, then solve the resulting equations for a system of molecules in order to predict its properties. Simulations are critical to a fundamental understanding of the surface and colloid chemistry of natural nanoparticles. A description of recent research results and publications is given on our simulations web site in the Earth Sciences Division at Lawrence Berkeley National Laboratory.
Current Projects:
- Structure and reactivity of biogenic layer type minerals
- Biogeochemistry of arsenic in surface waters and groundwater
- Mineral controls on mercury methylation in estuarine sediments
- Structure and dynamics of supercritical carbon dioxide-brine mixtures in clay nanopores
- Ecogeochmical remediation of oil pollution in coastal marshlands
Laboratory Supervisor Andrew Yang
Graduate Students Collaborating
ResearchersThomas Azwell Ian Bourg Sharon Bone Kideok Kwon Aric Newton Wei-Cheng Lo Melody Nocon Jasquelin Peña Catherine Pham
