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为进一步验证食管癌病因假说，ｌ９９１年对食管癌高发区磁县九个乡饮用水情况进行了全面调查，建立了仗用水档案，选择８７口井为监测点，对其三氮含量（即硝酸盐氮、亚硝酸盐氮、氨氮）连续３年进行监测，并以省境内食管癌低发区做对照。结果表明：高发区饮用水三氮含量显著高于低发区，且存在显著性差异。高发区饮用水三氢含量超过国家标准，受生物氮污染严重。该高发区饮用水卫生调查和水质监测系统的建立为现场改水提供了重要数据。
To further verify the hypothesis that the etiology of esophageal cancer, l991 years of higher nursing standards were investigated, survey established water battles, select 87 wells as the monitoring point, the three nitrogen content (ie, nitric acid Salt nitrogen, nitrite nitrogen, ammonia nitrogen) for 3 consecutive years of monitoring, and to the province’s low esophageal cancer control. The results showed that: the nitrogen content of drinking water in high incidence areas was significantly higher than that in low incidence areas, and there was a significant difference. High drinking water trihydrate content exceeds the national standard, seriously polluted by biological nitrogen. The high incidence of drinking water health survey and water quality monitoring system established to provide important data on the scene to water.