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目的分析南通市农村居民饮用水砷含量现状,为农村改水提供依据。方法 2009—2011年对南通市所有农村水厂于每年丰水期和枯水期至少采集1份水样,检测砷含量等项目,同时调查监测点水源类型、覆盖人口等信息。结果 2009、2010、2011年砷不合格率分别为7.2%,1.5%,1.0%。2010、2011年砷不合格率分别与2009年相比,差异均有统计学意义(P<0.05);其中不合格水样砷含量值最低为0.011 mg/L,最高值为0.063 mg/L。2010年砷不合格饮用水覆盖人口比例为4.02%,2009年为12.25%,差异有统计学意义(P<0.01);2011年为1.69%,与2010年相比,差异有统计学意义(P<0.05)。结论区域供水使农村居民饮用水水质有了明显改善,饮用水砷不合格的潜在危害正逐步减小。
Objective To analyze the current status of drinking water arsenic content of rural residents in Nantong City and provide the basis for rural water improvement. Methods During 2009-2011, all rural waterworks in Nantong collected at least one water sample during the wet season and the dry season each year to test the arsenic content and other items. At the same time, it investigated the types of water sources and coverage of population in the monitoring sites. Results 2009, 2010, 2011 arsenic unqualified rate was 7.2%, 1.5%, 1.0%. The arsenic unqualified rates in 2010 and 2011 were significantly different from those in 2009 (P <0.05). The lowest arsenic content in unqualified water samples was 0.011 mg / L and the highest was 0.063 mg / L. In 2010, the proportion of unqualified drinking water covered population was 4.2% in 2009 and 12.25% in 2009, with a significant difference (P <0.01) and 1.69% in 2011, which was significantly different from that in 2010 (P <0.05). Conclusions Regional water supply has significantly improved the quality of drinking water for rural residents, and the potential harm of unqualified drinking water arsenic is gradually decreasing.