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chemistry of As becomes the chemistry of arsenate; the estimated half-time of <br />arsenic in soils is about 6.5 years, although losses of 60% in 3 years and 67% <br />in 7 years have been reported (Woolson 1975). Additional research is <br />warranted on the role of arsenic in crop production, and in nutrition, with <br />special reference to essentiality for aquatic and terrestrial wildlife. <br />13