2019年—2022年平顶山市农村饮用水耗氧量监测结果分析

Monitoring and analysis of oxygen consumption of drinking water in rural areas of Pingdingshan from 2019 to 2022

目的了解2019年—2022年平顶山市农村生活饮用水中耗氧量在不同年度、季节和类型水样中耗氧量的变化特点,为下一步研究饮用水耗氧量与健康关系提供科学依据。方法对2019年—2022年1344份水样耗氧量测定资料进行分类整理,其中供水信息通过现场调查方式收集,水样的采集、保存、运输和检测均按照《生活饮用水标准检验方法》(GB/T 5750—2006)进行,水质检测结果按照《生活饮用水卫生标准》(GB/T 5749—2006)进行评价,采用非参数检验进行结果分析。结果水样耗氧量合格率为100%,中位数为0.218 mg/L,各年份间耗氧量水平差异有统计学意义。第2季度耗氧量值开始升高至第3季度最高,为0.272 mg/L;第4季度开始下降,第一季度耗氧量值最低,为0.140 mg/L。4个季度耗氧量分布差异有统计学意义。末梢水耗氧量高于出厂水耗氧量,分别为0.223 mg/L和0.208 mg/L,两者之间耗氧量比较差异无统计学意义。结论平顶山市农村生活饮用水耗氧量整体处于较好水平,但仍应注意季节变化带来的波动,切实保障农村居民饮水安全。

Objective This paper aims to assess the variation characteristics of oxygen consumption in drinking water of rural areas in Pingdingshan from 2019 to 2022 in annual durations,wet and dry seasons and water source types,so as to provide scientific basis for the research on the relationship between health and the oxygen consumption of drinking water.Methods A total of 1344 oxygen consumption water samples from 2019 to 2022 were tested and classified.Water supply information was obtained from on-site surveillance,and drinking water samples were collected,preserved,transported and tested according to the Standard Examination Methods for Drinking Water(GB/T 5750—2006),and the quality of drinking water was evaluated based on the Hygienic Standard for Drinking Water(GB/T 5749—2006),and the results were analyzed by nonparametric test.Results The qualified rate was 100% in four years,with a median value of 0.218 mg/L.There was statistical significance on the differences in oxygen consumption levels in different years.The oxygen consumption value in the second quarter began to rise to the highest value in the third quarter(0.272 mg/L).In the fourth quarter,it began to decline,and the oxygen consumption in the first quarter was the lowest(0.140 mg/L).The distribution difference of oxygen consumption in the four quarters was statistically significant.The oxygen consumption of end water was 0.223 mg/L and 0.208 mg/L higher than that of factory water,respectively,and there was no statistical significance on the difference between them.Conclusion The oxygen consumption of drinking water in the rural area of Pingdingshan was generally in an appropriate state,but we should still pay attention to the fluctuations caused by seasonal changes to ensure the safety of rural drinking water.