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m <br />C. <br />R <br />r <br />C <br />m <br />O <br />a <br />x <br />0 <br />a - <br />0 <br />OC - <br />-1 <br />-1 <br />16- <br />14 H2 Se 03 <br />12 (10-SO <br />10 <br />Se04 2- 02 <br />s <br />HSeO <br />6 3 <br />a (10-30) <br />2 Se(0) <br />o Se03 2- <br />2 <br />a H2Se <br />6 HSe- -- <br />s <br />0 <br />2 20 <br />4 ('10-20) (10-751 (10-10) X72 <br />6 1 I <br />2 4 6 8 40 7z <br />pH <br />Fig. 3. Predominance areas for dissolved selenium species in response to pH and redox <br />potential (Masscheleyn and Patrick 1993).