ABSTRACT
Selenium (Se) is widely used in various industries such as glass, pig-
ment, pesticide, stainless steel, and photoelectric cell production.1
Wastewater from these industries contains considerable amounts
of soluble Se, selenate (SeO2-4 ) and selenite (SeO 23 ). Furthermore,
irrigation of Se-rich fields causes an increase in the concentration
of soluble Se in drainage water. High concentrations of soluble Se
are acutely and chronically toxic to organisms inhabiting aquatic
environments.2
