Download Arsenic: environmental chemistry, health threats and waste by Kevin Henke PDF

By Kevin Henke

ISBN-10: 0470027584

ISBN-13: 9780470027585

This publication provides an outline of the chemistry, geology, toxicology and environmental affects of arsenic, offering details on rather universal arsenic minerals and their key homes. furthermore, it comprises discussions at the environmental affects of the discharge of arsenic from mining and coal combustion. 

even supposing the environmental rules of other international locations fluctuate and alter through the years, well-known overseas, North American, and ecu directions and laws on arsenic could be reviewed.

  • Includes details on fresh environmental catastrophes (e.g. Bangladesh and China)
  • A thorough dialogue of the arsenic cycle, together with the cosmological beginning of arsenic
  • Includes Appendices supplying large thesaurus and size conversion tables

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Extra info for Arsenic: environmental chemistry, health threats and waste treatment

Example text

4). 5 Arsenates Most arsenate minerals result from the extensive oxidation of elemental arsenic, arsenides, or arsenosulfides in the weathering of hydrothermal deposits and metamorphic and intrusive igneous rocks. 5). Scorodite (FeAsO4 ·2H2 O) and amorphous Fe(III) arsenates often precipitate on the surfaces of oxidizing arsenopyrite or from aerated water that has been saturated with As(V) from the weathering and dissolution of arsenopyrite ((Foster, 2003), 40; Chapter 3; (Krause and Ettel, 1988), 851; (Williams, 2001), 273; (Craw, Falconer and Youngson, 2003), 73).

5. 4). 5 Arsenates Most arsenate minerals result from the extensive oxidation of elemental arsenic, arsenides, or arsenosulfides in the weathering of hydrothermal deposits and metamorphic and intrusive igneous rocks. 5). Scorodite (FeAsO4 ·2H2 O) and amorphous Fe(III) arsenates often precipitate on the surfaces of oxidizing arsenopyrite or from aerated water that has been saturated with As(V) from the weathering and dissolution of arsenopyrite ((Foster, 2003), 40; Chapter 3; (Krause and Ettel, 1988), 851; (Williams, 2001), 273; (Craw, Falconer and Youngson, 2003), 73).

8 mg L−1 . 5 mg L−1 (Lengke and Tempel, 2003), 864. Under the same conditions, the oxidation rate of amorphous AsS is faster than the rate for realgar by a factor of 2–38 (Lengke and Tempel, 2003), 868. The valence state of arsenic is a critical factor in effectively treating the contaminant in water. Any As(III) or other reduced forms of arsenic usually require oxidation to As(V) before water treatment technologies can be successfully implemented (Chapter 7). 3). By oxidizing dissolved As(III) to As(V) in pH 2–9 waters, As(III) converts into more reactive As(V) oxyanions, such as H2 AsO4 − and HAsO4 2− .

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