Comparison of pesticides in eight U.S. urban streams

摘要: Little is known of the occurrence pesticides in urban streams compared to draining agricultural areas. Water samples from eight across United States were analyzed for 75 and seven transformation products. For six streams, paired used comparisons. The herbicides detected most frequently prometon, simazine, atrazine, tebuthiuron, metolachlor, insecticides diazinon, carbaryl, chlorpyrifos, malathion. In contrast similar-sized total insecticide concentrations commonly exceeded herbicide these streams. general, temporal concentration patterns consistent with characteristics local growing season. carbaryl diazinon criteria protection aquatic life many spring summer. When country as a whole considered, estimated mass contributed by areas dwarfed contribution areas, but insecticides, contributions may be similar. results this study suggest that should not overlooked when assessing sources monitoring surface waters.