北京市通州区地下水卫生学调查

目的：了解北京市通州区农村地下水水质卫生状况，为今后农村改水提供基础资料。方法：采用分层抽样方法监测北京市通州区各乡自备井水源水。结果：各乡水质卫生状况参差不齐，马桥乡的水质完全合格率为100％，而徐辛庄、郎府、甘棠3个乡的水质完全合格率为0。26项检验指标中超标项目有13项，主要超标项目为氨氮、浊度、总铁、锰。总硬度、砷、氟、亚硝酸盐的超标存在地区性差异。结论：北京市通州区农村地下水受到不同程度的污染，地下水水质呈现地区差异，急待改善。

Sanitary Investigation on Ground Water in Tongzhou District, Beijing

Objective To understand the sanitary quality of ground water in countryside of Tongzhou District, Beijing, and to provide basic data for water improvment in countryside in future. Methods The water sampls collected from wells by stratified sampling method in every township of Tongzhou District, Beijing were analyzed. Results The sanitarg quality of source water samples from every township showed significant differences. The completely-qualified rate of source water was 100% in Maqiao, 0% in Xuxinzhuang, Langfu, Gantang. 13 indexes among 26 determined sanitary indexes including ammonia nitrogen, turbidity, total iron, and manganese exceeded the related standards. The concentrations of total hardness, arsenic, fluoride nitrite exceeded the related standards. Regional differences in contaminative degree were noticed. Conclusion The ground water in countryside of Tongzhou District was contaminated in different degree, and show regional differences in water quality, which needed to be improved urgently.