Sample survey of iodine contents of drinking water in the rural areas of Yanchi county

Objective To understand the iodine contents level of drinking water in the rural areas of Yanchi county in Ningxia and provide the basis for taking strategies and measures to prevent and control iodine deficiency disorders.Methods In Yanchi county,5 well water samples were selected from the east,west,south,north,and the center of every natural village having drinking well,2 ending tap water samples from every tap water spot,and the kiln water or the Yellow River water samples from the representable natural villages.Arsenic Cerium Redox method was used to determine the iodine content of water samples.Results The iodine contents of well water and of tap water were all above 10μg/L,and the one of kiln water and of the Yellow River water were all below 10μg/L.The contents were in turn from high to low: well watertap waterYellow River waterkiln water,and the difference was significant(P0.05).The iodine content of 87.2% well and tap water samples were suitable,but the one of 80.0% kiln water samples was insufficient.There were respectively 39.0%,59.5% and 1.5% natural villages being iodine deficiency,suitable and excessive by iodine content of drinking water.Conclusion Iodine deficiency,suitable and excessive area exist in Yanchi county,but mainly is iodine suitable area and goiter region are not discovered.