Simultaneous Determination of Pesticides and their Seasonal Variation in Ishikari River Basin.
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概要
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Distribution and seasonal variation of 81 compounds (pesticides and transformation products) in approximately 200 water samples of Ishikari river were monitored during two years (1998. 4-2000. 3) at two sampling sites. In this monitoring, 20 herbicides, 12 fungicides, 13 insecticides and 3 transfomation products were detected from the river at 0.001 μg/l-0.821 μg/l in median. The total pesticides concentrations in all river water samples increased during and after their application. There was a distinct seasonal peak in herbicide concentrations during June and July, while those fungicide and insecticide concentrations during July and August.<BR>The load of a compound is the mass of that compound transported in a stream during a specified period. The load can be estimated as the product of the concentration of the compound and the flow volume of the river measured at the Ishikariohashi Bridge and Karikiohashi Bridge.<BR>The total annual loads of pesticides in Ishikari river streams was estimated as 4.53 tons.
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