The Effect of Coexisting Organic Compounds on the Bioconcentration of ²⁰³HgCl₂ in Medaka Olyzias latipes

Abstract

Medaka was exposed to ₂₀₃HgGl₂ (05μg-Hg/l) with a coexisting humic acid (0-20mg/l) for 40h. With the increase of humic acid concentration, the uptake of ₂₀₃Hg in the fish decreased. The bioconcentration factor (BCF) of ₂₀₃Hg, for the fish exposed to ₂₀₃Hg with 20mg/l httmic acid, were approximately one twentieth compared to that of the control. In the case of coexisting 0.01mM-EDTA or citric acid, the BCFs were similar to that of the control. However, for the co-existing cysteine or glutathion, the BCFs dropped remarkably.