Stability of Metal-Arsenic Solids in Drinking Water Systems
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 4, Issue 1
Abstract
The solubility of arsenic solids is of importance in public health, water treatment, and geochemistry. This work focuses on copper-arsenic and barium-arsenic solids. Experiments were conducted at conditions typical of water distribution systems (e.g., pH ∼ 7, T = 20°C, μ ∼ 10−2.8 M, and typical elemental concentrations). The solubility product for barium hydrogen arsenate (BaHAsO4) was verified by both precipitation and dissolution experiments as a log Ksp value of −5.51 ± 0.02, consistent with literature values. Evidence collected in systems with copper were not consistent with a single arsenic containing solid. Instead data appeared to favor sorption mechanisms with removed arsenic:copper ratios at 0.3:1. The results allow for improved predictability of arsenic behavior in manmade and natural systems.
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 4 • Issue 1 • January 2000
Pages: 31 - 35
History
Received: Aug 30, 1999
Published online: Jan 1, 2000
Published in print: Jan 2000
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