Read e-book online Arsenic in Ground Water: Geochemistry and Occurrence PDF

By Alan H. Welch, Kenneth G. Stollenwerk

ISBN-10: 0306479567

ISBN-13: 9780306479564

ISBN-10: 1402073178

ISBN-13: 9781402073175

This publication consolidates a lot of what's recognized concerning the geochemistry of arsenic and gives new info on relationships among excessive concentrations of arsenic in floor water and geochemical environments. the subject material of this e-book levels in scope from molecular-scale geochemical procedures that have an effect on the mobility of arsenic in flooring water, to arsenic infected flooring water on the nationwide scale. Chapters have been contributed via a global crew of study scientists from a huge diversity of backgrounds.

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Example text

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.

3). , 1995; Nesbitt and Reinke, 1999). This observation may hold true for As-bearing sulfides generally, and may be related to differences in electronic structure (the 38 Chapter 2 2. , 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.

1940), Ivakin et al. (1976), and Pokrovski et al. (1996). 5 Complications in chloride media Wagman et al. (1968, 1982) gave a value for the Gibbs energy of formation of undissociated arsenic acid. That value was obtained from values reported by Foerster and Pressprich (1927) and auxiliary values. Foerster and Pressprich (1927) measured the electromotive force (emf) of cells in which the electrochemical reaction was presumed to be: To suppress dissociation of the arsenic acid, the measurements were conducted in solutions acidified with hydrochloric acid of (1 to 6) M.

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


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