Abstract
Abstract Farm ditches flowing into three rivers important to fisheries in the Lower Fraser Valley of British Columbia, Canada, were sampled periodically at seven locations from July to December in 1991, to determine the distribution of total residues of endosulfan (END) including endosulfan sulfate, in ditch water and sediment. Residues of END were detected at levels ranging from 7 ‐7,825 μg/kg in crop soils collected close to the sites for sampling ditch water and sediments. END concentrations in ditch water varied from 0.01 μg/L to 13.4 μg/L, whereas those in ditch sediments ranged from 5 μg/kg to 2,461 μg/kg. Of the two stereoisomers monitored, the concentration of endosulfan II (ENDII) was detected at 8, 7 and 6 times higher than endosulfan I (BNDI) in soils, sediments and water, respectively. The transformation product, endosulfan sulfate (ENDS) was also found in the three substrates, with mean concentrations of 1, 015 μg/kg, 218 μg/kg, and 0.30 μg/L for soils, sediments and water, respectively. The ...
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