岷县地震灾区饮用水水质状况调查

Investigation on drinking water quality of the earthquake-stricken area in Minxian

目的为及时掌握岷县"7.22"地震灾后饮用水的基本情况,为保障灾区饮用水卫生安全工作提供决策依据。方法按《生活饮用水标准检验方法》GB5750-2006规定采样和检测,共检测应急水样112份。结果地震前岷县水质总大肠菌群合格率为40.82%;大肠埃希菌合格率为76.53%;菌落总数合格率为92.86%,浑浊度、pH值、色度、臭和味、氨氮、硝酸盐、氯化物以及耗氧量合格率均在87%以上;地震后岷县灾区水质总大肠菌群合格率为10.71%;大肠埃希菌合格率为24.11%;菌落总数合格率为80.36%,浑浊度、pH值、色度、臭和味、氨氮、硝酸盐、氯化物以及耗氧量合格率均在90%以上。结论微生物指标地震前后差异有统计学差异,理化指标地震前后差异无统计学差异,应加强水源保护和水质消毒及检测。

Objective To timely understand the basic information of drinking water in earthquake- stricken area after the ＂7. 22＂Minxian earthquake,so as to provide decision- making basis for drinking water safety in earthquake- stricken area. Methods One hundred and twelve emergency water samples were collected to detect the water quality in accordance with ＂Standard examination method for drinking water＂GB5750-2006. Results Before the earthquake,the pass rate of total coliforms was 40. 82% in drinking water of Minxian,that of Escherichia coli was 76. 53%,that of total number of bacteria was 92. 86%,and that of turbidity,PH,color,smell and taste,ammonia nitrogen,nitrate,chloride and oxygen consumption were all more than 87%. While after the earthquake,the pass rates of the above indexes were 10. 71%,24. 11%,80. 36%,more than 90% in turn. Conclusion Microbial indicators have significant statistical difference before and after the earthquake, while the difference of physical and chemical indicators has no statistical significance before and after the earthquake,it is suggested that the water sources protection and water disinfection and testing should be strengthened in earthquake- stricken area.