Analysis of the investigation results of iodine in drinking water in Hainan / 中华地方病学杂志

ABSTRACT

Objective To grasp the distribution of iodine in drinking water in the environment of Hainan Province,and provide scientific basis for prevention and treatment of iodine deficiency disorders.Methods In 2017,in all cities (counties,districts) in Hainan Province,townships were used as units to collect water samples to detect iodine content according to their different water supply methods.In the townships with median drinking water iodine ＞ 10 μg/L,the administrative village (neighborhood committee) was used as a unit to collect water sample to detect iodine content.According to the geographical location (central mountainous area,eastern coast,western coast),water source type (tap water,intubation well,spring water),and well depth,the distribution of water iodine was analyzed.Results A total of 2 566 water samples were detected in 21 cities (counties,districts),the median water iodine was 6.0 μg/L,range was 0.1-150.6 μg/L,the median water iodine of all cities (counties,districts) was ＜ 10 μg/L.The median water iodine in the central mountainous area,eastern coast,and western coast were 3.3,6.5,6.5 μg/L,respectively;tap water,intubation well,and spring water were 5.6,6.4,1.3 μg/L,respectively;0-,100-,200-,≥300 m well depth were 6.6,5.1,4.2,and 1.5 μg/L,respectively.The water iodine content range was 0.2-17.9 μg/L in 230 townships in the province,there were 12 townships with the median water iodine ＞ 10 μg/L,including 133 administrative villages (neighborhood committees),and 737 water samples were detected,the water iodine content range was 1.0-37.1 μg/L.Conclusions All cities (counties,districts) in Hainan Province belong to iodine deficiency areas,the central mountainous area is even more serious.Most of the townships in the province are in iodine deficiency.No administrative villages (neighborhood committeea) with high iodine have been found.The province should continue to implement salt iodization to prevent and treat iodine deficiency disorders.