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Volcanic <br />Atmospheric ~ activity <br />depaaition <br />Fossil fuel <br />burning / ~tnerMq <br />Plant uptake ( ~ <br />VV V Y/V ~o°Y ~dJ~J' \\ <br />VVVV//VV////// T {f <br />ei o.oe~~m I a r~nC <br />e ~ mo.m o m ~~chin0 <br />Volatilization <br />Se <br />Se <br />Adwrption/ Organism uptake <br />dawrption and rslssss <br />Se IIVI ~~ Se IVII <br />Anoxic <br />Ss 101 E-~ Ss 1-111 <br />Chsmiul snd biological <br />transformations <br />Mineral formation <br />(metal selenides or <br />Se -sulfides) <br />00 <br />r~i <br />z <br />l~ <br />17tl <br />a <br />r <br />.. <br />-~ <br />'~ <br />^r <br />C~7 <br />i.r <br />Fig. 1-3. A schematic diagram illustrating the cycling of Se through the environment. <br />