"五水共治"对杭州市外环境居民生活饮用水碘含量的影响

The impact of"Five Water Governance"policy on iodine level of drinking water of residents in the external environment in Hangzhou City

目的了解杭州市"五水共治"实施对外环境居民生活饮用水碘含量的影响,为因地制宜、科学补碘提供科学依据。方法2017年5月,在杭州实施"五水共治"过程中,在13个区(县、市)以乡镇为单位按照供水方式的不同采集水样,水碘检测采用国家碘缺乏病参照实验室推荐的"适合缺碘及高碘地区水碘检测的方法"。按照水源类型(自来水、井水、泉水),区域(城市、郊区、农村)等进行水碘分布状况分析。结果全市共检测水样722份,水碘中位数为1.1μg/L,范围为0.3~105.0μg/L,各区(县、市)水碘中位数均<10μg/L。全市182个乡镇中,集中供水94个,分散供水3个,混合供水85个;自来水、井水和泉水的水碘中位数分别为1.3、0.9、1.6μg/L,城区、郊区、农村的水碘中位数分别为3.6、1.2、1.0μg/L。结论杭州市外环境居民生活饮用水碘含量偏低,仍属于碘缺乏地区,在开展"五水共治"措施的同时应继续实行食盐加碘防治碘缺乏病的策略。

Objective To study the impact of"Five Water Governance"policy on iodine in drinking water of residents in the external environment in Hangzhou City,and to provide scientific basis for iodine supplementation in accordance with local conditions.Methods In May 2017,in the process of implementing the"Five Water Governance"program in Hangzhou City,water samples were collected in 13 districts(counties and cities)with towns as units according to different water supply methods.The"Method for Iodine Detection in Iodine-deficient and High-iodine Areas"recommended by the National Iodine Deficiency Disorders Reference Laboratory was adopted for water iodine detection.According to the water source(tap water,well water,spring water)and geographical location(urban area,suburb area,rural area),the distribution of water iodine was analyzed.Results A total of 722 water samples were tested in the city,the median water iodine was 1.1μg/L,ranged from 0.3 to 105.0μg/L,the median water iodine of all districts(counties,cities)was<10μg/L.There were 182 townships in the city,with 94 townships providing centralized water supply,3 townships decentralized water supply,and 85 townships mixed water supply.The median water iodine levels in tap water,well water,and spring water were 1.3,0.9,and 1.6μg/L,respectively,and the median iodine levels in urban,suburban,and rural water were 3.6,1.2,and 1.0μg/L,respectively.Conclusions The iodine content in the drinking water of residents in the external environment of Hangzhou City is relatively low,and it still belongs to iodine deficiency areas.The strategy of salt iodization for prevention and treatment of iodine deficiency disorders should be continued while the measures of"Five Water Governance"are carried out.