possible role in osmoregulation as well as detoxification for these organisms. (16)
The survey of California fresh water arsenic contamination cited above demonstrates the wide range of arsenic concentrations that assay and removal systems must be adapted to. Analysis of a sample for arsenic containing compounds must also take into account the various oxidation states in which the arsenic moiety is found. As (III) (arsenite form) and As (V) (arsenate forms) behave differently in the environment, and require different assay conditions for accurate measurement. Any assay system that differentiates the various forms of soluble arsenic must take these electrochemical differences into account.
In the study by Anderson and Bruland, almost all water sources examined yielded a wide variety of inorganic and organic arsenic containing compounds. (1) McGeehan and Naylor indicate that ion chromatographic methods using an electrochemical detector in a carbonate-bicarbonate buffer system have yielded good analytic results at levels greater than 0.002 mg L-1. (11) McGeehan and Naylor state that this method offers "improved detection of As (V) over previously published detection methods."
A number of methodologies have been used to remove arsenic containing compounds from water. Lee and Rosehart have described an ion exchange method for arsenic removal. (9) Nurijev et al. and Vlasova et al. modified the ion exchange method by incorporating strongly basic ion exchangers. (12) Sato et al. and Pakholkov et al. added metal hydroxides and oxides to the ion exchange system. (14) Th
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