定西市安定区2014年-2017年农村饮用水水质监测结果分析

Monitoring results analysis of rural drinking water quality in Anding District of Dingxi during 2014-2017

目的了解定西市安定区农村饮用水现状及变化情况,为农村安全饮水工程提供科学依据。方法按照《生活饮用水卫生标准》(GB 5749—2006)对安定区农村饮用水水质进行分析评价。结果 2014年-2017年共监测水样576份,合格430份,总合格率为74.6%。2014年-2017年水样合格率逐年上升(χ~2=144.1,P<0.01),监测指标中,菌落总数、硫酸盐、氯化物、溶解性总固体、总硬度的合格率较低。2014年、2015年、2016年丰水期和枯水期水质合格率差异无统计学意义(P>0.05),2017年差异有统计学意义(P<0.05)。感官指标、一般化学指标和毒理学指标年度合格率差异有统计学意义(P<0.05),细菌学指标差异无统计学意义(P>0.05)。结论安定区农村饮用水水质仍需提高,应继续推进农村改水建设,规范净化和消毒措施,保证居民用水安全。

Objective To understand the current situation and the change of drinking water in rural areas of Anding District, so as to provide scientific basis for rural drinking water safety project. Methods Water samples in rural areas of Anding District were analyzed according to Drinking Water Health Standards(GB 5749-2006). Results A total of 576 water samples were tested, 430 water samples were qualified, with the qualification rate of 74.6%. The qualification rates of water samples increased annually, and the differences were statistically significant(χ^2=144.1, P<0.01). Among the monitoring indexes, the qualified rates of total bacteria, sulfate, chloride, total solubility solid and total hardness were lower. The differences in qualification rates of water had no statistical significance between raining seasons and dry seasons in 2014, 2015, 2016(P>0.05), but differences had statistical significance in 2017(P<0.05). The qualification rates of sensory, general chemical and toxicological indicators were statistically significant(P<0.05) in different years, but differences in bacterial indicators had no statistical significance(P>0.05). Conclusion It is essential to promote the drinking water quality in rural area of Anding District, and the construction of water improvement should be promoted;purification and disinfection measures should be standardized so as to ensure water security for the residents.