北京市门头沟区农村自备井水质总硬度分布特征

目的了解北京市门头沟区农村自备水源水质总硬度分布特征，为农村自备水源管理提供依据。方法采用普查的方法对2012--2013年农村使用的自备集中式供水水源水进行监测，检测依据GB／T5750—2006《生活饮用水标准检验方法》，评价标准为GB5740～2006《生活饮用水卫生标准》。结果门头沟区农村居民自备水源生活饮用水总硬度均值为（287．5±76．1）mg／L，超标率2．9％。总硬度含量在区域间分布差异有统计学意义（P〈0．05）；总硬度与pH值、氯化物、硫酸盐、溶解性总固体的相关性分析差异有统计学意义（P〈0．05）。结论门头沟区农村自备井水总硬度含量合格率较高；水质为硬水；在区域分布上，随海拔逐渐升高总硬度含量值逐渐减小。

Distribution characteristics of total hardness of rural self-prepare well water quality in Mentougou District of Beijing

Objective]To understand the distribution characteristics of total hardness of rural self-prepare well water quality in Mentougou district, provide basis for management of rural self-prepare water source. Methods ] The centralized water supply source water in rural area from 2012-2013 was monitored by census method. According to GB/T 5750-2006 ＂Drinking Water Standard Testing Method＂, the water was detected. According to GB 5740-2006 ＂Hygienic Standard for Drinking Water＂, the results were evaluated. Results ] The mean of total hardness of self-prepare water source drinking water was （287.5 ± 76.1 ） mg/L, exceeded rate was 2.9%. The difference of total hardness content in different areas was statistically significant （ P 〈 0.05 ） ; the correlation of total hardness with pH, chloride, sulfate and total dissolved solids was statistically significant {P 〈 0.05 ）. Conclusion ] The qual- ified rates of total hardness of rural self-prepare well water is higher, water is hard water. In the regional distribution, with the increasing of elevation, the contents of total hardness decrease.