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本文以１９８８、１９９２和１９９３年洋河流域张家口市部分水稻田污染受害事故为背景，通过事故现场调查资料分析、洋河水质监测、宣化区污染源调查、水稻的药害暴露实验和模型计算，研究了含有除草剂莠去津和乙草胺的河水灌溉对苗期水稻的危害。结果显示，河水中莠去津和乙草胺对水稻苗期的安全灌溉浓度分别为０．０１ｍｇ／Ｌ和０．０５ｍｇ／Ｌ；河水中莠去津对水稻的致死浓度是０．１ｍｇ／Ｌ；ｐＨ、ＮＨ３－Ｎ和表面活性剂对这种危害作用具有一定的协同效应；为了满足河水对水稻的灌溉水质要求，污染源允许排放的莠去津和乙草胺分别为１．０ｋｇ／ｄ和２．０ｋｇ／ｄ。
Based on accidental investigation of accident in Zhangjiakou, 1988, 1992 and 1993, the data of Yanghe River water quality monitoring, pollution source investigation in Xuanhua District, rice exposure experiment and model calculation were studied. Harm to the seedling stage of rice irrigation with herbicide atrazine and acetochlor. The results showed that the safe irrigation concentrations of atrazine and acetochlor in the rice seedling were 0.01 mg / L and 0.05 mg / L, respectively. The lethal concentration of atrazine in the river water was 0.1 mg / L ; PH, NH3-N and surfactant had certain synergistic effect on this harmful effect. In order to meet the requirement of irrigation water quality of rice by river water, the allow permissible emissions of atrazine and acetochlor were 1.0kg / d and 2.0kg / d.