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目的对北京市农村饮用水水质中总有机碳(TOC)状况从时间和空间上进行调查、分析,已全面了解农村饮用水体中有机物的污染程度。方法在10个涉农区县中随机抽取10%~15%的水厂(或水站),采取分层随机抽样的方法选择样本,分别进行丰水期和枯水期2次采样,采集样本量2 055件,利用SPSS 13.0统计软件进行数据分析。结果10个涉农区县饮用水中TOC的浓度为0.197 mg/L~7.63 mg/L,TOC的平均浓度为0.79 mg/L。北京市东部地区中的平谷、顺义和通州区饮用水中TOC在全市处于较低水平;高出全市平均线的有大兴、怀柔、密云和延庆4个区县,其中只有1个供水单位枯水期时TOC出现异常。结论 10个涉农区县饮用水中TOC的浓度均低于2 mg/L;农村饮用水中TOC的分布呈现北高南低的态势。
Objective To investigate the status of total organic carbon (TOC) in rural drinking water quality in Beijing from time to space and analyze the degree of organic pollution in rural drinking water. Methods 10% ~ 15% water plants (or water stations) were randomly selected from 10 agro-related counties and counties, stratified random sampling method was used to select the samples and 2 samples were collected during the wet season and the dry season respectively. The sample size was 2 055, using SPSS 13.0 statistical software for data analysis. Results The concentrations of TOC in drinking water from 10 farming districts and counties ranged from 0.197 mg / L to 7.63 mg / L and that of TOC was 0.79 mg / L. The TOC in Pinggu, Shunyi and Tongzhou districts in the eastern part of Beijing is at a relatively low level in the city. Among the four districts and counties above the city average, there are Daxing, Huairou, Miyun and Yanqing, of which only one is the water supply unit during the dry season TOC abnormalities. Conclusions The concentrations of TOC in drinking water of 10 farming-related counties are lower than 2 mg / L. The distribution of TOC in drinking water of rural areas shows a trend of north high and low in south.