Bioaccumulation and elimination of avermectin B"1"a in the earthworms (Eisenia fetida) [An article from: Chemosphere]

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Description:
The acute toxicity, bioaccumulation, and elimination of avermectin B"1"a (AVM B"1"a) in earthworm (Eisenia fetida) were investigated in different exposure systems. The LC"5"0 of AVM B"1"a on earthworms were 24.1mg/kg and 17.1mg/kg, respectively, for 7 and 14days in artificial soil. The LC"5"0 tested by the filter paper for 2days was 4.63@mg/cm^2. The earthworms were cultivated in artificial soil containing 0.6mg/kg and 3.0mg/kg AVM B"1"a, respectively for bioaccumulation experiments. The AVM B"1"a residues in earthworms were determined with HPLC-fluorescence method. The results showed that AVM B"1"a was taken up from the concentrated artificial soil by the earthworms and the steady-state levels were reached after 9-18days of exposure. On the 18th day, the final concentrations of AVM B"1"a in the earthworms treated with two different dosages were 107ng/g and 165ng/g, respectively; there were not significantly accumulation. About 80.0% and 94.8% of the accumulated AVM B"1"a were eliminated respectively in two groups within 1day after they were exposed to AVM B"1"a-free soil, but a trace amount of AVM B"1"a was found for a relative long time in earthworms.