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中文摘要：
系统研究了黄河、海河和辽河中3种常用除草剂 MCPA、2，4-D 和 Bentazone 的分布特征及其来源。结果表明，3种除草剂除 Bentazone在黄河水体中未检出外，其余均有检出。季节和空间分析表明，大部分目标物丰水期质量浓度高于枯水期，可能与夏季农作物除草剂使用量较大有关；从上游到下游化合物质量浓度逐渐升高，可能是河岸面源污染引起。水生态风险初步分析显示，3种除草剂对研究水体中的水生生物均为低风险。
英文摘要：
The distribution characteristics and sources of typical herbicide （MCPA,2,4-D and Bentazone） in the Yellow River,Hai River and Liao River were analyzed.The results showed that Bentazone was not detected in the Yellow River,the rest were detected.Seasonal and spatial analysis of the herbicides showed that concentra-tion of most compounds in the wet season were higher than those in the dry season,which may be caused by the large amount use of herbicides in summer.The concentration of these compounds gradually increased from up-stream to downstream,which may be caused by non-point source pollution.Preliminary analysis of the risk of a-quatic ecosystems showed that these compounds posed a low risk to aquatic organisms in Yellow River,Hai River and Liao River.
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