Fate of pesticides in a shallow reservoir
Fate of pesticides in a shallow reservoir
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农药在浅水库中的归宿
DOI：
10.2166/wst.2000.0572
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发表时间：
2000
影响因子：
2.7
通讯作者：
M. Okada
中科院分区：
文献类型：
--
作者：
N. Itagaki;O. Nagafuchi;K. Takimoto;M. Okada
根据农药在河流和水库中的水平和垂直分布，研究了农药在这两个系统中的去向。在18种农药中，MEP、硫威、BPMC和异丙硫烷的浓度最高。除异丙硫烷外，这些农药的悬浮组分不仅在暴雨天气中检测到，而且在干旱天气中也检测到。悬浮物中农药检出率分别为：MEP 59.8 ~ 61.9%，硫虫威34.6 ~ 38.9%,BPMC 17.0 ~ 19.0%。悬浮液中未检出异丙硫烷。
Based on the horizontal and vertical distributions of pesticides in the river and the reservoir, the fates of pesticides in these systems were investigated in this study. Four pesticides, i.e., MEP, thiobencarb, BPMC and isoprothiolane had the highest concentrations among the eighteen pesticides. These pesticides in suspended components except isoprothiolane were detected not only during stormy weather days but also during dry weather days. The percent detection of pesticides in suspended component was 59.8-61.9% in MEP, 34.6-38.9% in thiobencarb and 17.0–19.0% in BPMC. However, isoprothiolane in the suspended component was undetectable.
These pesticides in the suspended component have existed as a part of the suspended solids in the river, then disappeared by sedimentation during the flow of the river from the upper stream to the backwater in the reservoir. On the other hand, the pesticides in the dissolved components that flowed into the reservoir were uptaken or adsorbed by phytoplankton. Moreover, the concentrations of the less absorptive pesticides like isoprothiolane have decreased by dilution and diffusion in the reservoir.