Bioconcentration factor of relatively low concentrations of chlorophenols in Japanese medaka

The BCF values of PCP were from (4.9 ± 2.8) × 103 at the aqueous concentration of 0.074 ± 0.028 μg/l to (2.1 ± 1.4) × 103 at 9.70 ± 0.56 μg/l. The BCF value of 2,4-DCP were from (3.4 ± 3.0) × 102 at 0.235 ± 0.060 μg/l to 92 ± 27 at 27.3 ± 1.6 μg/l. Generally, BCF values increased as the aqueous concentrations of PCP or 2,4-DCP decreased. This finding suggests that a relatively low and realistic aqueous concentration of these compounds is necessary to more accurately determine their BCF values in natural aquatic environments. Conventional BCF experiments at higher aqueous concentrations may underestimate the BCF values.