Biogeochemistry of Environmentally Important Trace Elements by Yong Cai, Olin C. Braids

By Yong Cai, Olin C. Braids

Biogeochemistry of Environmentally vital hint Elements discusses destiny, shipping, and transformation in soils, waters, and crops in biogeochemistry of environmentally vital hint components, with a spotlight on arsenic, mercury, and selenium.

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D. ; Antai, E. ; Purdie, D. A. Estuar. Coast. Shelf Sci. 1995, 40, 435-440. 74. Howard, A. ; Apte, S. ; Comber, S. D. ; Morris, R. J. Estuar. Coast. Mar. Sci. 1988, 27, 427-443. 75. Riedel, G. F. Estuaries 1993, 16, 533-540. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2002. de 76. Francesconi, Κ. ; Edmonds, J. S. Adv. Inorg. Chem. 1997, 44, 147-189. 77. Santosa, S. ; Takahashi, M . ; Tanaka, S. Appl. Organomet. Chem. 1996, 10, 697-705. 78. Santosa, S. ; Tanaka, S. Appl. Organomet.

A. Abd El-Haleem , and Β. K. ch004 1 Soil and Crop Sciences Department, Texas A&M University, College Station, TX 77843 Center for Water Quality, Florida A&M University, Tallahassee, FL 32307 College of Agriculture, Zagazig University, Benha, Egypt 2 3 Chemical extraction represents an important tool for understanding arsenic bonding and speciation in soils, as well as for assessment and management of arsenic contaminated sites. The object of this paper is to review extraction mechanisms and discuss pitfalls to the successful application of extraction methodologies.

Adaptedfromreference 11). ; ACS Symposium Series; American Chemical Society: Washington, DC, 2002. ch004 100 0 50 100 150 200 Time , h Figure 5. 0) at a 200:1 P:As molar ratio. Previous studies have indicated that the ligand exchange of phosphate on goethite is both acid catalyzed and base catalyzed (15), and the rate of ligand exchange is accelerated under conditions of higher acidity or basicity, compared to near neutral conditions. Similar pH-dependent behavior might be expected for ligand exchange reactions involving As(V) and phosphate.

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