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Environmental Studies

By P M Chapman; William J Adams; Marjorie Brooks; SETAC (Society)

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2003; Moroder 2005; Unrine et al. 2007). indb 10 3/22/10 4:29:13 PM What You Need to Know about Selenium 11 Se (Se0), selenide (Se –2), selenite, and selenate, as well as methylated forms Sex(CH3)x. Selenate and selenite can be taken up by plants and converted to organic forms. These organic forms are usually analogues to S-containing biomolecules, especially amino acids. This conversion occurs through either nonspecific isosteric substitution for S in amino acids (selenocysteine or selenomethionine), or through co-translational conjugation of selenophosphate (SePO3–) to serine mediated by selenocysteine tRNA and selenocysteine synthase.

Patrick Shaw This book on Ecological Assessment of Selenium in the Aquatic Environment synthesizes and advances the state-of-the-science regarding this unique metalloid and identifies critical knowledge gaps. Assessment methods appropriate for other metals and metalloids are not always appropriate for selenium (Se). Selenium requires site-specific risk assessments to a much greater extent than do many other contaminants, including adequate quality assurance and quality control of chemical and biological analyses.

2006; Regester et al. 2006) and may play significant roles in the cycling of contaminants, including Se, in food webs (Hopkins 2006, 2007; Hopkins and Rowe 2010). In a system contaminated with coal combustion wastes in South Carolina (USA), water snakes (Nerodia fasciata) accumulated elevated concentrations of Se from the fish and amphibians they ingested (Hopkins et al. 1999). Based on indirect evidence from long-term controlled feeding studies (Hopkins et al. 2001, 2002a) and additional field studies on amphibians (Roe et al.

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