Arsenic in Ground Water Geochemistry and Occurrence by Alan H. Welch, Kenneth G. Stollenwerk

By Alan H. Welch, Kenneth G. Stollenwerk

Offers an outline of the fundamental techniques that impact arsenic incidence and shipping via offering adequate history info on arsenic geochemistry and outlines of high-arsenic flooring water. Of curiosity to scientists operating within the box of arsenic, overall healthiness execs drawn to arsenic publicity, and water-resource managers and regulators.

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Selective chemical extraction methods have been useful for empirical determination of the dominant chemical/mineralogical compartments retaining As in aquifer 2. , 1988) and do not provide the kind of information about interfacial reactions (particularly the composition and geometry of adsorbed As complexes) that geochemical modelers need for predictive purposes (Parks, 1990). Spectroscopic techniques (particularly infrared, x-ray photoelectron, and x-ray absorption spectroscopy) have been applied to fill the information gap about chemical speciation and interfacial reactions of As in model and natural materials.

2000). A recent report provides evidence that under anoxic laboratory conditions, solids can enhance the oxidative attack of and FeS by dissolved Fe(III), whereas in the absence of (and under sterile conditions), is not affected by dissolved Fe(III) or even (Shippers and Jorgensen, 2001). This reaction does not need molecular oxygen to proceed, and could potentially take place even in anoxic aquifers. Further study is needed on the stability of sulfides generally, and As-bearing sulfides in particular, under anoxic and suboxic conditions.

Krupp, 1990; Spycher and Reed, 1989). We had believed this controversy to have been settled recently by Helz et al. (1995) who utilized spectroscopy, molecular orbital calculations, and the solubility studies to arrive at the conclusion that the principal aqueous species in excess-sulfidic solutions are and Helz et al. 9 for the reaction: They also This value leads to Clarke and Helz (2000) analyzed phase behavior in the copper + arsenic + sulfur+ water system and obtained a somewhat different value for the equilibrium constant for eq 11.

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