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v <br />a <br />R <br />a <br />O <br />CL <br />x <br />O <br />d <br />_1 <br />-1 <br />10 <br />14 H2SeO3 <br />12 !7o-so <br />70 <br />SeO4 2- <br />8 02 <br />s HSeO3 _ X20 <br />4 30) <br />2 Se(0) <br />° SeO3 2- <br />2 <br />4 H 2 S e <br />e HSe- <br />a <br />0 <br />0 <br />4 ?7 <br />(10-20? is) (70-10) 2 <br />0 2 4 6 S In 12 14 <br />pH <br />Fig. 3. Predominance areas for dissolved selenium species in response to pH and redox <br />potential (Masscheleyn and Patrick 1993). <br />14