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为掌握天津市饮用水水质卫生状况,于2013年采集8件市区水厂出厂水、72件市区末梢水、2 051件区县末梢水、427件区县二次供水进行检测,采用Arc GIS 10.1软件对水质进行空间分析。结果显示,共监测水样2 882件,其中,出厂水、市区末梢水、区县末梢水和区县二次供水的合格率分别为100%,100%,86.36%和93.91%。主要超标指标为p H和菌落总数。区县二次供水水质合格率高于区县末梢水(P<0.01)。末梢水和二次供水的水质在时间分布(1~12月)均较稳定(P>0.05);但空间分布呈一定的地域差异(均P<0.01)。提示天津市城乡饮水水质总体状况较好,但部分区县水质合格率较低,存在饮水安全风险。
In order to grasp the hygienic condition of drinking water in Tianjin, eight municipal waterworks factory water, 72 urban peripheral water, 2,051 peripheral water districts and 427 secondary water districts were collected for testing in 2013. Arc GIS 10.1 software Spatial analysis of water quality. The results showed that a total of 2 882 water samples were monitored, of which 100%, 100%, 86.36% and 93.91% of the effluent from the factory water, the peripheral water in the urban area, the peripheral water in the districts and counties and the secondary water supply in the districts and counties were 100%, 100%, 86.36% and 93.91% respectively. The main indicators of excessive p H and the total number of colonies. District secondary water quality qualified rate higher than the district water (P <0.01). The water quality of the peripheral water and the secondary water supply were stable in time (January to December) (P> 0.05), but the spatial distribution showed some regional differences (all P <0.01). Suggesting that the overall water quality of drinking water in urban and rural areas of Tianjin is good, but the qualified rate of water quality in some districts and counties is relatively low, which poses the risk of drinking water safety.