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

By Alan H. Welch, Kenneth G. Stollenwerk

This booklet consolidates a lot of what's recognized concerning the geochemistry of arsenic and offers new info on relationships among excessive concentrations of arsenic in flooring water and geochemical environments. the subject material of this e-book levels in scope from molecular-scale geochemical methods that impact the mobility of arsenic in floor water, to arsenic infected flooring water on the nationwide scale. Chapters have been contributed through a global workforce of study scientists from a huge variety of backgrounds.

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Extra info for Arsenic in Ground Water: Geochemistry and Occurrence

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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.

The presence of large amounts of chloride in the acidified arsenic solutions is problematic. , 1940). Arcand (1957) determined distribution coefficients of As(III) between a hydrochloric acid phase and a dichlorodiethyl ether phase. He used his measurements, determined at different concentrations of HCl(aq), to argue that complexes of the type existed in those solutions for x from 0 to 3. He used solubility data of arsenic trioxide in and to argue the existence of in acid solutions also. He calculated approximate equilibrium constants for formation of , , and .

This value is in very good agreement with the enthalpy of formation determined by Bryndzia and Kleppa (1988). Based on the lack of 1. 15 K equilibrium data, we gave insignificant weight to the fluorine combustion results for both orpiment and realgar. Helz et al. (1995) interpreted differences between the solubility determinations made independently by Webster (1990) and by Mironova et al. (1984) as being due to differences in the Gibbs energies of formation of the crystalline orpiment samples used in the respective studies.

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