GES 265, Soil Chemical Dynamics

Welcome to the Course Homepage

(you won't find anything fancy here, just the basics to help keep us synchronized)


Instructor: Scott Fendorf

Office: 301 Green Earth Sciences

Phone: 3-5238

email: Fendorf@pangea


Date Topic Leader Reading
T, 1/9 Introduction SF  
Th, 1/11 Reaction Kinetics SF Ch. 1, Handout
T, 1/16 Empirical Kinetics and Diffusion SF Handouts
Th, 1/18 Redox Reactions SF Ch. 1, Ch. 7
T, 1/23 Redox Reactions: Predicted profiles

Lect. 1, Mixing of redox profiles

Lect. 2, Overlapping redox profiles




Ch. 7


Th, 1/25 Lect. 3, Biological Reduction

Lect 4, Biotic vs abiotic



T, 1/30 Lect 5, Redox Cycling

Lect 6, Redox, Cycling



Th, 2/1 DISCUSSION, Redox Kristin,

Chris, Kaimin

T, 2/6 Redox, summary and details

(Fenton chemistry and orbital overlap)

Th, 2/8 Ion Retention and Exchange SF Ch. 3
T, 2/13 Ion Exchange and the Electrified Interface SF  
Th, 2/15 Chemical Retention SF Ch. 4
T, 2/20 Lect. 7, Adsorption isotherms

Lect. 8, Electrostatic forces



Th, 2/22 Lect. 9, Complexation Models

Lect. 10, Specific Surface Sites



T, 2/27 Lect. 11, Generalized Model

DISCUSSION: Sorption models


Deb, Carrie, Colleen

Th, 3/1 Molecular configuration


SF Ch. 6


T, 3/6 Dissolution/Precipitation SF  
Th, 3/8 Lect. 1,2  Surface Precipitation

Lect. 13, Modeling Dissolution



T, 3/13 Lect. 14, Alterations in Dissolution

Lect. 15, Predicting Dissolution Rates



Th, 3/15 DISCUSSION Jeff, John, Laura  





For Thursday, January 11

Steinfeld, J.I., J.S. Francisco, and W.L. Hase. Basic Concept of Kinetics.

For Tuesday, January 16

Lecture: Influence of Diffusion

Ogwada, R.A., and D.L. Sparks. 1986. Kinetics of ion exchange on clay minerals and soil: I. Evalution of methods. Soil Sci. Soc. Am. J. 50: 1162-1164.

Ogwada, R.A., and D.L. Sparks. 1986. Kinetics of ion exchange on clay minerals and soil: II. Elucidation of rate-limiting steps. Soil Sci. Soc. Am. J. 50: 1162-1164.



For Thursday, January 18

Lecture: Redox Profiles: Standard Conception

McBride, Chapter 7

Patrick, W.H., Jr., and A. Jugsujinda. 1992. Sequential reduction and oxidation of inorganic nitrogen, manganese, and iron in flooded soil. Soil Sci. Soc. Am. J. 56: 1071-1074.

For Tuesday, January 23

Lecture: Overlapping Redox Profiles

Postma, D., and R. Jakobsen. 1996. Redox zonation: Equilibrium constraints on the Fe(III)/SO4-reduction interface. Geochim. Cosmochim. Acta 60: 3169-3175.

Wang, Y., and P. Van Cappellen. 1996. A multicomponent reactive transport model for early diagenesis: Application to redox cycling in coastal marine sediments. Geochim. Cosmochim. Acta 60: 2993-3014.


For Thursday, January 25

Lecture: Biological and abiological reduction

dos Santos Afonso, M., and W. Stumm. 1992. Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide. Langmuir 8: 1671-1675.

Lovley, D.R., E.J. Phillips, and D.L. Lonergan. 1991. Enzymatic versus nonenzymatic mechanisms for Fe(III) reduction in aquatic sediments. Environ. Sci. Technol. 25: 1062-1067.

Wielinga, B.W., M.M. Mizuba, C.M. Hansel, and S. Fendorf. 2001. Iron catalyzed reduction of chromate by dissimilatory iron-reducing bacteria. Environ. Sci. Technol. 35(4): xxxx.



For Tuesday, January 30

Lecture: Redox cycles

Van Cappellen, P., E. Viollier, A. Roychoudhury, L. Clark, E. Ingall, K. Lowe, and T. Dichristina. 1998. Biogeochemical cycles of manganese and iron at the oxic-anoxic transition of a stratified marine basin (Orca Basin, Gulf of Mexico). Environ. Sci. Technol. 32: 2931-2939.

Hunter, K.S., Y. Wang, and P. Van Cappellen. 1998. Kinetic modeling of microbially-driven redox chemistry of subsurface environments: coupling transport, microbial metabolism and geochemistry. J. Hydrology 209: 53-80.


For Thursday,Feb. 1

Discussion: Redox Processes





For Tuesday, February 20

Lecture: Adsorption Isotherms and Electrostatic Forces

Barrow, N.J. 1978. The description of phosphate adsorption curves. J. Soil Science 29: 447-462.

Swartz, C.H., and P.M. Gschwend. 1998. Mechanisms controlling release of colloids to groundwater in a southeastern coastal plain aquifer sand. Environ. Sci. Technol. 32: 1779-1785.

Van Olphen, H. 1963. An Introduction to Clay Colloid Chemistry. Wiley Interscience, NY.


For Thursday, February 22

Lecture: Complexation Models and Sited

Schindler, P.W., and W. Stumm. 1987. The surface chemistry of oxides, hydroxides, and oxide minerals. pp. 83-110 In W. Stumm (ed.) Aquatic Surface Chemistry. Wiley and Sons, New York.

Agashe, K.B., and J.R. Regalbuto. 1997. A revised physical theory for adsorption of metal complexes at oxide surfaces. J. Colloid Interface Sci. 185: 174-189.

Bargar, J.R., S.N. Towle, G.E. Brown, Jr., and G.A. Parks. 1997. XAFS and bond-valence determination of the structures and compositions of surface functional groups and Pb(II) and Co(II) sorption products on single-crystal a-Al2O3. J. Colloid Interface Sci. 185: 473-492.


For Tuesday, February 24

Lecture: Model Application

Davis, J.A., J.A. Coston, D.B. Kent, and C.C. Fuller. 1998. Application of the surface complexation concept to complex mineral assemblages. Environ. Sci. Technol. 32: 2820-2828.

Kent, D.B., R.H. Abrams, J.A. Davis, J.A. Coston, and D.R. LeBlanc. 2000. Modeling the variable pH on the transport of zinc in a contaminated aquifer using semiempirical surface complexation models. Water Res. Res. 36: 2411-3425.





For Thursday, March 8

Lecture: Predicting Dissolution Rates

Gerard, F., B. Fritz, A. Clement, J.-L. Crovisier. 1998. General dissolution of aluminum speciation-dependent kinetic dissolution rate law in water-rock modelling. Chem. Geol. 151: 247-258.

Ford, R.G., A.C. Scheinost, K.G. Scheckel, and D.L. Sparks. 1999. The link between clay mineral weathering and the stabilization of Ni surface precipitates. Environ. Sci. Technol. 33: 3140-3144.



For Tuesday, March 13

Lecture: Heterogeneous Dissolution and Precipitation (An action packed day!)

Nugent, M.A., S.L. Brantley, C.G. Pantano, and P.A. Maurice. 1998. The influence of natural mineral coatings on feldspar weathering.

Chen, J.-H., L.W. Lion, W.C. Ghiorse, and M.L. Shuler. 1995. Mobilization of adsorbed cadmium and lead in aquifer material by bacterial extracellular polymers. Wat. Res. 29: 421-430.

Sverjensky, D.A. 1992. Linear free energy relations for predicting dissolution rates of solids. Nature 358: 310-313.

Casey, W.H., and H.R. Westrich. 1992. Control of dissolution rates of orhtosilicate minerals by divalent metal-oxygen bonds. Nature 355: 157-159.

Phillips, B.L., W.H. Casey, and M. Karlsson. 2000. Bonding and reactivity at oxide mineral surfaces from model aqueous complexes. Nature 404: 379-382.