Seasonal and Spatial Studies on Pesticide Residues in Surface Waters of the Shinano River in Japan

Water samples collected once a week from early April 1996 to the end of August 1996 from four sites on the Shinano River in Japan were analyzed for pesticides and their metabolites using a gas chromatograph−mass spectrometer. Among the total of 53 chemicals found, 22 were herbicides, 15 were insecti...

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