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KMID : 0382420010270020108
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 2 p.108 ~ p.118
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Bioconcentration of IBP , Methidathion and Piperophos in Brachydanio rerio ( zebrafish )
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Ha Young-Duck
Min Kyung-Jin
Lee Seung-Gon
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Abstract
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This study was performed to investigate the bioconcentration of IBP, methidathion and piperophos. The BCFs(bioconcentration factor), depuration rate constants for three pesticides in zebrafish(Brachydanio rerio) were measured by OECD guideline 305. The concentration of test pesticides were one-hundredth and onethousandth concentration of 96-hrs LC_50 in accordance with OECD guideline 305. The results obtained are summarized as follows:
The average BCF values of IBP were 5.31(n=4) and 7.30(n=4) at one-hundredth and one-thousandth concentration of 96-hrs LC_50. The average BCF values of methidathion were 8.72(n=4) and 11.25(n=4), the average BCF values of piperophos were 34.30(n=4) and 42.60(n=4). Depuration rate constants of IBP were 0.09(h^-1) and 0.08(h^-1), half-life of IBP were 7.70 and 8.66 at each tested concentration. The concentrations of IBP in zebrafish at low and high concentrations rapidly decreased after 12(0.243 ㎍/g) and 12 hours(0.040 ㎍/g). Depuration rate constants of methidathion were 0.40(h^-1), half-life of methidathion were 1.73 at one-hundredth and of 96-hrs LC_50, respectively. The concentrations of methidathion in zebrafish at high concentrations rapidly decreased after 6 hours(0.18 ㎍/g). Depuration rate constant of low concentration was not measured because methidathion in zebrafish was depurated in 6 hours. Depuration rate constants of piperophos were 0.15(h^-1) and 0.44(h^-1), half-life of piperophos were 4.62 and 1.58 at each tested concentration. The concentrations of piperophos in zebrafish at low and high concentrations rapidly decreased after 12(0.26㎍/g) and 6 hours(0.015㎍/g). It was suggested that high BCF of piperophos was due to high Kow(octanol-water partition coefficient). The possibility of bioconcenration was not likely to be high because of its rapid K_DEP(depuration rate constant) in the enviroment. It was suggested that low BCF of methidathion showed lowest Kow as well as the most rapid K_DEP. Therefore, the possibility of bioconcenration was not occured in the enviroment. It was suggested that the BCF determined for IBP was lower than that of other pesticides due to high Sw(water solubility), slow K_DEP. Therefore, IBP revealed little bioconcentration effect on in aquatic ecosystem.
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