Abstract
In recent years, a large number of pesticides have been produced and discharged into the resources of water supply. The data on their bioconcentration and excretion by aquatic lives are useful for the evaluation of their safety to man and their contamination of fishes in lake, river and sea. Fugacity model is developed for calculating the concentration of pesticides in a simple generic foodchain. Pesticide uptake efficiency from water, excretion rate, and chemical assimilation efficiency are variable as a function of the octanol-water partition coefficient, Kow. The model indicates the significance of the growth rate and variable efficiency of uptake in calculation of the bioaccumulation factor BAF under field condition. Food chain effects are not significant up to log Kow of-5. For logKow of 5-7, calculated and obserbed field concentration factors in benthic organisms indicate significant elevations above calculated field BAF value.The analysis was made by using the data at 30 stations in the river of Fukui Pref., for the purpose of suporting the monitoring by aquatic lives as indicator for contamination of CNP and the application of Fugacity Model to the monitoring results.
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