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By Alan H. Welch, Kenneth G. Stollenwerk

This publication consolidates a lot of what's identified concerning the geochemistry of arsenic and offers new details on relationships among excessive concentrations of arsenic in floor water and geochemical environments. the subject material of this publication levels in scope from molecular-scale geochemical tactics that have an effect on the mobility of arsenic in floor water, to arsenic infected flooring water on the nationwide scale. Chapters have been contributed by means of a world crew of study scientists from a vast variety of backgrounds.

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Extra resources for Arsenic in Ground Water: Geochemistry and Occurrence

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The precipitate was x-ray amorphous, but the ratio of Fe to As was estimated at 1:1 by SEM-EDS. Further complicating the problem, little thermodynamic data for metal arsenite salts exists, to our knowledge. Despite thermodynamic predictions and direct observations that metal arsenates control dissolved As concentrations under certain geochemical conditions, minerals containing As oxoanions have not been directly documented microscopically or spectroscopically in aquifer sediments, to our knowledge.

The reactivity of As-bearing sulfides in the subsurface is not well understood. For example, under equivalent geochemical and hydraulic conditions, will an aquifer containing arsenopyrite have greater dissolved As concentrations than one containing arsenian pyrite? , (2000) and references therein], and an XPS study demonstrates that arsenopyrite oxidizes relatively slowly upon exposure to air or water (Richardson and Vaughan, 1989). , 1995) Fig. 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.

1. Arsenic thermodynamic data and environmental geochemistry 25 3. Claudetite and arsenolite are stable in equilibrium with waters of high pH. 4. Orpiment is more stable than realgar at standard state conditions and is stable in equilibrium with waters of low pH. 5. Orpiment and realgar can form under a wide variety of conditions that include hydrothermal mineralization, hot spring environments, mine fire sublimates, and fumarolic encrustations. 6. Realgar appears to be more stable than orpiment in high temperature environments (100-200°C).

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