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目的探讨广西农村饮用水水质铁指标的含量分布及其与其它水质指标含量的相关关系,为选择针对性的水质净化措施提供依据。方法分别于2010年枯水期(3月)和丰水期(7-8月)对广西107个县(市、区)按比例分层采集不同水源类型和供水方式的农村饮用水水样10 044份,其中集中式供水水样8 690份,分散式供水水样1 354份,依据国家有关标准对水质铁、锰、色度、浑浊度和pH等指标进行检测和评价,并对铁指标超标与其它检测指标超标进行描述性和相关性分析。结果 10 044份水样中,水质铁指标超标率为3.69%。不同水源类型水质铁指标超标率差异有统计学意义(χ2=31.717,P<0.01),地表水超标率高于地下水;不同供水类型(集中式和分散式)水质铁指标超标率差异无统计学意义(χ2=0.218,P>0.05);不同地理区域铁指标超标率桂南>桂东>桂西>桂北>桂中。分析结果表明,水质铁指标超标与色度、锰、浑浊度指标超标呈现正相关,而与pH指标超标无关联。结论广西农村饮用水水质铁指标超标与水质色度、锰和浑浊度指标超标有一定相关关系。
Objective To explore the distribution of iron content in drinking water and its relationship with other water quality indicators in Guangxi rural areas and provide the basis for selecting targeted water quality purification measures. Methods A total of 10 044 samples of rural drinking water samples of different types of water sources and water supply were collected in different stages in the dry season (March) and wet season (July-August) of 2010 in 107 counties (cities and districts) Including 8 690 centralized water supply samples and 1 354 distributed water samples. According to relevant national standards, the indexes of iron, manganese, color, turbidity and pH were tested and evaluated. Exceeded other test indicators for descriptive and correlation analysis. Results In 10 044 water samples, the iron standard exceeded the standard of 3.69%. The iron exceeded the standard rate of water quality in different types of water sources was statistically significant (χ2 = 31.717, P <0.01), the exceeding rate of surface water was higher than that of groundwater; there was no significant difference in the iron standard excess of different types of water (centralized and decentralized) Significance (χ2 = 0.218, P> 0.05). The iron standard in different geographical areas exceeded the standard of Gui Nan> Guidong> Guixi> Gui North> Guizhong. The analysis results show that there is a positive correlation between water quality iron standard excess and chroma, manganese and turbidity index exceed standard, but no correlation with excessive pH index. Conclusion The iron standard of drinking water quality in rural areas in Guangxi exceeded the standard of water quality, manganese and turbidity.