三亚市2017年居民饮用水水碘含量监测

目的 了解三亚市居民饮用水水碘分布情况,为推进科学补碘提供数据支持依据。方法 2017年5月—6月按照《全国外环境水碘分布调查方案》在全市以乡（镇、街道办事处）为单位采集居民生活饮用水进行水碘含量调查。集中供水乡（镇、街道办事处）采集1份末梢水水样;分散供水乡（镇、街道办事处）,在东、西、南、北、中5部分各随机抽取1个行政村,每个行政村按东、西、南、北、中各随机抽取1口井,少于5口井的行政村全部抽取;部分集中供水乡（镇、街道办事处）在东、西、南、北、中5部分各随机抽取1个行政村,集中供水行政村采集1份末梢水水样,分散供水行政村抽样按东、西、南、北、中各随机抽取1口井,少于5口井的行政村全部抽取。水碘检测采用电感耦合等离子体质谱法。结果 三亚市13个乡（镇、街道办事处）,只有1个乡（镇、街道办事处）水碘中位数大于10.0 μg/L。全市共采集水样137份,其中分散供水水样103份、集中供水水样34份,所有集中供水水样水碘均低于10.0 μg/L。137份水样中水碘在10.0 μg/L以下的比例为69.34%,10.0~91.0 μg/L比例为30.66%,无水样水碘超过100.0 μg/L。浅井水碘中位数高于泉水水碘中位数（P<0.05）和集中供水水碘中位数（P<0.05）、插管井水碘中位数高于泉水水碘中位数（P<0.05）。结论 三亚市生活饮用水水碘含量总体上处于较低水平,三亚绝大部分地区属于碘缺乏地区,人们需继续食用碘盐。

Monitoring results of iodine contents in residents’ drinking water in Sanya, 2017

Objective To understand the iodine distribution condition in residents’ drinking water in order to provide the evidence for scientific iodine supplementation. Methods An investigation on iodine contents in residents’ drinking water was carried out based on the unit of township (sub-district) according to the Investigation Plan of Iodine Distribution in Environmental Water in the Country from May to June, 2017. In the township with centralized water supply, one terminal water sample was collected. In the township with dispersed water supply, the water samples were randomly collected in one well of five parts of an administrative village (on the direction of east, west, south, north, and central parts), and the administrative villages were randomly sampled from the five parts of the township (on the direction of east, west, south, north, and central parts). In other townships with sub-centralized water supply, the water samples were also collected according to principle above-mentioned. The water iodine was detected with inductively coupled plasma mass spectrometry. Results The median of water iodine content was higher than 10.0 μg/L in one township among 13 townships in Sanya City. A total of 137 water samples were collected including 103 samples from the townships with dispersed water supply and 34 samples from the townships with centralized water supply. The iodine content was below 10.0 μg/L in all the water samples from the townships with centralized water supply. Among the 137 water samples, the proportion of the water iodine below 10.0 μg/L was 69.34% and the proportion of the water iodine between 10.0 μg/L and 91.0 μg/L was 30.66%, and there was no water sample in which the water iodine was higher than 100.0 μg/L. The median of water iodine content in the shallow shift water samples was higher than that in the spring water samples (P<0.05) and centralized water supply samples (P<0.05), and the median of water iodine content in the intubation well water samples was higher than that in the spring water samples (P<0.05). Conclusion sThe iodine content of drinking water in Sanya City is on the low level on the whole, and the most areas of Sanya City belong to iodine deficiency areas. Therefore, the people still need to consume iodized salt continually.