ABSTRACT
This chapter addresses the characteristics and nature of organic Selenium (Se) toxicity to aquatic organisms, based on the most current state of scientic knowledge. As such, the information contained in this chapter relates to the toxicity assessment phase of aquatic ecological risk assessments. While the inorganic forms of Se (e.g., selenate, selenite) can be toxic at concentrations in the 102 μg/L range via waterborne exposures, dietary exposure to mg/kg concentrations of organic Se poses a greater hazard to certain classes of aquatic biota, such as sh and birds (Skorupa and Ohlendorf 1991; USEPA 1998).
