2020年澄江市生活饮用水中三氯甲烷、四氯化碳检测结果分析

Analysis of the Detection Results of Chloroform and Carbon Tetrachloride in the Drinking Water of Chengjiang City in 2020

目的通过检测澄江市居民生活饮用水中枯、丰水期水源水、出厂水、管网末梢水中三氯甲烷、四氯化碳浓度,以期更好地了解澄江市居民生活饮用水中的三氯甲烷、四氯化碳被污染现状。方法按照《生活饮用水标准检验方法》(GB/T5750.8-2006)顶空毛细管柱气相色谱法检测2020年澄江市生活饮用水样品中三氯甲烷、四氯化碳含量,采用SPSS 25.0统计软件进行分析,以P<0.05为差异有统计学意义。结果共累计检测到水样156份,其中枯水期88份,丰水期68份,三氯甲烷、四氯化碳的综合检测结果合格率均达到100%。枯水期水源水、出厂水、管网末梢水分别检测28份、27份和33份,三氯甲烷检出率分别为15.0%、33.3%和36.4%,丰水期水源水、出厂水、管网末梢水分别检测12份、19份和37份,三氯甲烷检出率为0%、5.3%和8.7%。枯、丰水期三氯甲烷检出率和浓度变化为水源水<出厂水<管网末梢水,丰水期三氯甲烷平均浓度高于枯水期。结论2020年澄江市生活饮用水枯、丰水期水样中的三氯甲烷均有检出,但都在国家规定的安全范围内,不存在超标现象,四氯化碳的浓度均未检出,有机物检测指标三氯甲烷、四氯化碳合格,生活饮用水质量尚可。

Objective To better understand the current status of chloroform and carbon tetrachloride pollution in the drinking water of Chengjiang,the concentration of chloroform and carbon tetrachloride in the raw water,treated water,and terminal tap water during dry season and rainy season were tested.Methods According to the Standard Test Method for Drinking Water(GB/T5750.8-2006),headspace capillary column gas chromatography was employed in the test of chloroform and carbon tetrachloride content in samples of drinking water in Chengjiang,2020.and then SPSS25.0 statistical software was used to analyze the data.Results A total of 156 water samples were tested in the current research,with 88 collected during dry season and 68 during rainy season.The qualified rate of the comprehensive test results of chloroform and carbon tetrachloride both reached 100%.During the dry season,28,27,and 33 samples of the raw water,treated water,and terminal tap water were tested,and the detection rate of chloroform was 15%,33.3%,and 36.4%respectively.Simultaneously,during the rainy season,12,19,and 37 samples of the raw water,treated water,and terminal tap water were tested,and the detection rate of chloroform was 0%,5.3%,and 8.7%respectively.An increase trend of the detection rate and concentration of chloroform during both seasons have been noted from the samples of the raw water,treated water,and terminal tap water.The mean concentration of chloroform in samples collected during rainy season was higher than that during dry season.Conclusion In 2020,the chloroform were both detected in the water samples during the dry and rainy seasons of Chengjiang City,but they were all within the safe range stipulated by the state,without over-standard phenomenon.And the carbon tetrachloride was not detected.The detection index of organic matter are qualified,and the quality of drinking water is acceptable.