近年来,有越来越多的人知道,生活环境缺碘对人类的危害是极为严重而广泛的。那么,我们赖以生存的环境为什么缺碘呢?原来,碘是一种非常活泼、易溶于水的非金属元素。据考察,碘存在于地球上,存在于海洋里、空气中。它的分部相当广泛而又相当不均匀。山区少于平原,平原少于沿海,沿海少于海洋,这是由于高原、山区、平原的碘化物经过雨、雪水冲刷,流入海洋的缘故。 In recent years, more and more people are aware that the harm to human beings caused by lack of iodine in the living environment is extremely serious and widespread. So why do we lack iodine in the environment we live in? Originally, iodine was a very lively, water-soluble, non-metallic element. According to investigation, iodine exists on the earth, exists in the sea, the air. Its division is quite extensive and rather uneven. The mountainous area is less than the plain, the plain is less than the coast, the coastal area is less than the ocean, which is due to the iodine in the plateau, mountainous area and plains washed by rain, snow and into the sea.