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Selenite <br />1 <br />0.9 <br />0.8 <br />0.7 <br />0.6 <br />.o <br />a 0.5 <br />a <br />0.4 <br />0.3 <br />0.2 <br />0.1 <br />0 <br />0 <br />pH <br />• <br />Figure 2 - Selenite speciation as a function of pH (alpha is the fraction of the total <br />dissolved selenite consisting of the given species). • <br />Selenate, the most oxidized form of selenium, forms anions in solution over the pl I <br />range 0 to 14. At pH values less than about 2 HSeO4- is stable, while at pll values above <br />about 1.9 SeO4 is the most stable (see Figure 3). <br />0 <br />2 4 6 8 10 12 14