摘要目的 调查河南省水源性高碘地区水中碘的存在形态.方法 2013年12月至2014年1月在河南省高碘地区(濮阳、新乡、开封和商丘),选择50个停供碘盐和集中供水均在5年(含)以上的村、乡、镇的水厂,每个水厂采集3份末梢水水样,采用碘-淀粉分光光度法测定水中碘含量以及鉴别水中碘存在形态,分析河南省高碘地区水碘存在的形态与分布情况.结果 共采集了403份水样,其中286份水样符合条件(水碘≥80 μg/L).符合条件水样中,6份以碘离子形态存在,139份以碘酸根离子和碘离子混存形态存在,141份以碘酸根离子形态存在.水碘含量＜ 150 μg/L的样品中,以碘酸根离子和碘离子混存形态的样品占26.67％(12/45),以碘酸根离子形态存在的样品占73.33％(33/45).水碘含量在150～ 299μg/L的样品中,以碘酸根离子和碘离子混存形态的样品占79.67％(98/123),以碘酸根离子形态存在的样品占24.39％(30/123),以碘离子形态存在的样品仅占4.88％(6/123).水碘含量≥300 μg/L的样品中,以碘酸根离子和碘离子混存形态的样品占81.81％(9/11),以碘离子形态存在的样品占18.18％ (2/11).结论 河南省水源性高碘地区,水源中的水碘存在碘离子和碘酸根离子形态,以碘酸根离子、碘离子和碘酸根离子混存两种形态为主,未发现以高碘酸根离子形态存在的水源.

abstractsObjective To investigate the forms of water iodine in areas with excessive iodine in water of Henan Province.Methods From December 2013 to January 2014,50 water plants in 4 cities (Puyang,Xinxiang,Kaifeng and Shangqiu cities) of Henan Province were selected from the areas with excessive iodine in water where iodized salt and centralized water supply were stopped for more than 5 years.In each selected water plant,3 water samples were collected.I2-Starch Spectrophotometer was used to measure the iodine content and identify the forms of iodine in water samples.Results A total of 403 water samples were collected and ultimately 286 samples met the requirement (water iodine ≥ 80 μg/L).Among the 286 samples,iodine existed in the forms of iodide in 6 water samples,of both iodate and iodide in 139 water samples,and of iodate in 141 water samples.In water samples with iodine content lower than 150 μg/L,the proportions of forms of iodide and both iodate and iodide,were 26.67％ (12/45) and 73.33％ (33/45),respectively.In water samples with iodine content between 150-299 μg/L,the proportions of the forms of iodide,both iodate and iodide,and iodate,were 4.88％ (6/123),79.67％ (98/123) and 24.39％ (30/123),respectively.In water samples with iodine content higher than 300 μg/L,the proportions of the forms of iodide and both iodate and iodide,were 18.18％ (2/11) and 81.81％ (9/11),respectively.Conclusions In areas with excessive water iodine in Henan Province,iodine mainly exists in the forms of iodate,or both iodate and iodide.No sample is found to contain periodate.