碘是人体的必要元素 ,但碘的摄取量偏高或偏低同样对人体造成严重的伤害 [1]。现已查明 [1] ,我国山东、山西、河北、新疆等省 (区 )的十几个县均存在水源性高碘问题。以地处渤海岸边的山东无棣县为例 ,为了解决群众的吃水难问题 ,当地政府实施了“利民工程”,1 998年共打深机 Iodine is an essential element of the body, but high or low iodine intake also cause serious harm to the human body [1]. It has been ascertained that [1] there is a problem of high water-source iodine in more than a dozen counties in Shandong, Shanxi, Hebei, and Xinjiang (autonomous regions) in our country. Take Wudi County, Shandong Province, which is located on the coast of the Bohai Sea as an example. In order to solve the difficulty of draft for the masses, the local government implemented the “Project of Benefiting the People”