Geochemistry

Aquatic chemistry: interfacial and interspecies processes by Chin Pao Huang, Charles R. O'Melia, James J. Morgan

By Chin Pao Huang, Charles R. O'Melia, James J. Morgan

Presents complete experimental and theoretical analyses of chemical reactions in multiphase, multispecies platforms. Explores the foundations and functions of floor chemistry, soil chemistry, microbiology, geochemistry, redox response, and colloid chemistry to environmental platforms. Examines the impact of abiotic and biotic interfaces on chemical reactions in aquatic atmosphere platforms. comprises chapters via Werner Stumm, the founding father of aquatic chemistry.

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24. ; Stumm, W Langmuir 1991, 7, 809--813. 25. Sulzberger, B. Chemistry of the Solid-Water Interface; Wiley Interscience: New York, 1992; Chapter 10. 26. Lakind, J. ; Stone, A. T. Geochim. Cosmochim. Acta 1989,53, 961-971. 27. ; Stumm, W. Langmuir 1992, 8, 1671. 28. Plummer, L. ; Wigley, T. M. ; Parkhurst, D. L. Am. J. Sci. 1978,278, 179-216. 29. ; Stumm, W Geochim. Cosmochim. Acta 1989, 53, 69--77. 30. Wehrli, B. ; Wiley Interscience, New York, 1990; pp 311--336. 31. Stone, A. T. Geochim. Cosmochim.

03 I E o 5 7 9 0 10-6 10-5 10-4 H2Utot 1M] Figure 7. The effect of ligands and metal ions on surface protonation of a hydrous oxide is illustrated by two examples (1). Part a: Binding of a ligand (pH 7) to hematite, which increases surface protonation. 4), which reduces surface protonation. Part c: Surface protonation of hematite alone as a function of pH (jor comparison). All data were calCtJlated with the following surface complex formation equilibria (I = 5 X 10-0 _'I). Electrostatic correction was made by diffuse double layer model.

Chemical reactions and conditional eqUilibrium constants were written out explicitly to describe the average acid-base behavior of a hydroxylated surface, that is, and SOH2 +(s) --+ SOH(s) + H+(aq) (3a) SOH(s) --+ SO-(s) + H+(aq) (4a) 2. :H (4b) X SOII \\·here SOH(s) represents 1 mol of acidic surface hydroxyl groups and x is a mole fraction. [The notation here differs somewhat from that found in Stumm et al. ] Equation 2 was invoked again to relate Klc and ~c to the corresponding thermodynamic equilibrium constants, but this time it was stated flatly that ·"there is no direct way to obtain I/Is theoretically or experimentally" (5).

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