江苏农村水厂水碘含量监测结果分析

Analysis of water iodine content in Jiangsu rural water factory

目的进一步了解和掌握江苏省水碘含量分布及影响因素。方法2012-2014年,在江苏省63个县(市、区)的农村集中式供水水厂中抽取半数水厂作为调查点,调查和分析各个调查点的监测类型、水厂类型、水源类型、自检能力、消毒情况、水处理方式等。每个调查点分别采集1份末梢水水样,测定水碘含量。结果2012-2014年共监测江河水938份,水碘中位数为5.9μg/L;湖泊水57份,水碘中位数为6.8μg/L;水库水228份,水碘中位数为7.1μg/L;沟塘水43份,水碘中位数为6.9μg/L;深井水5474份,水碘中位数为28.2μg/L;浅井水162份,水碘中位数为30.9μg/L,不同水源类型水样水碘中位数比较差异有统计学意义(χ2=844.9,P<0.05)。水源水为湖泊水、水库水、沟塘水、深井水、浅井水水碘中位数在不同水厂监测类型间比较差异有统计学的意义(χ2=9.6、6.3、9.7、121.2、38.1,P均<0.05)。水源水为江河水、水库水、深井水、浅井水水碘中位数在不同水厂类型间比较差异有统计学意义(χ2=109.5、39.0、153.3、7.6,P均<0.05)。水源水为江河水、湖泊水、深井水、浅井水水碘中位数在不同水厂自检能力上比较差异有统计学的意义(χ2=62.5、5.1、29.9、10.1,P均<0.05)。水源水为水库水、深井水、浅井水水碘中位数在不同水厂消毒情况上比较差异有统计学意义(χ2=12.1、12.4、35.7,P均<0.05)。水源水为江河水、水库水、深井水、浅井水水碘中位数在不同水处理方式上比较差异有统计学意义(χ2=9.5、21.2、102.4、46.9,P均<0.05)。结论江苏省农村不同水源类型水样水碘含量不同,水碘含量高低受监测类型、水厂类型、自检能力、消毒情况、水处理方式等因素影响。

Objective To further understand and master the distribution and influencing factors of water iodine in Jiangsu Province. Methods From 2012 to 2014, half of the water plants in rural centralized water supply monitoring plants in 63 counties (cities, districts) of Jiangsu Province were selected as survey sites, and the types of monitoring, types of water plants, types of water sources, self-inspection ability, disinfection situation, water treatment methods were investigated and analyzed. One sample of peripheral water was collected from each survey site to determine the water iodine content. Results From 2012-2014, there were 938 samples of river water were monitored, and the median water iodine was 5.9 μg/L. There were 57 samples of lake water were monitored, the median water iodine was 6.8 μg/L. There were 228 samples of reservoir water were monitored, and the median water iodine was 7.1 μg/L. There were 43 samples of gully pond water were monitored, and the median water iodine was 6.9 μg/L. There were 5 474 samples of deep well water were monitored, and the median water iodine was 28.2 μg/L. There were 162 samples of shallow well water were monitored, and the median water iodine was 30.9 μg/L. There was a statistically significant difference in the median iodine content of water samples from different water sources (χ2= 844.9, P < 0.05). The differences of median iodine of lake water, reservoir water, gully pond water, deep well water and shallow well water among different monitoring types were significant (χ2= 9.6, 6.3, 9.7, 121.2, 38.1, P < 0.05). The differences of median iodine of river water, reservoir water, deep well water and shallow well water among different types of water plants were significant (χ2= 109.5, 39.0, 153.3, 7.6, P < 0.05). The iodine contents of river water, lake water, deep well water and shallow well water had significant difference in self-inspection ability of different water plants (χ2= 62.5, 5.1, 29.9, 10.1, P < 0.05). The iodine content of reservoir water, deep well water and shallow well water were significantly different in different disinfection situation (χ2= 12.1, 12.4, 35.7, P < 0.05). The medians iodine of river water, reservoir water, deep well water and shallow well water had significant difference in different water treatment methods (χ2= 9.5, 21.2, 102.4, 46.9, P < 0.05). Conclusions The water iodine contents of water samples in different types of water sources in rural area of Jiangsu Province are different. The level of water iodine is affected by factors such as monitoring type, type of water plant, self-inspection ability, disinfection situation and water treatment method.