我国降水、降尘中硒、碘、氟的研究

研究了我国东甫沿海至西北地区降水、降尘中硒、碘、氟的分布及其影响因素,结果表明。我国降水硒、碘、氟含量范围分别为0.03—0.59ppb、0.3—3.8ppb和0.03—0.6ppm,一般为0.1—0.2ppb、1—2ppb和0.05—0.1ppm,其主要影响因素为人类活动,海洋、风沙及土壤微生物亦各有不同程度的影响。以集尘桶采集的降尘硒、碘、氟含量均远高于当地表层土壤,主要受当地大气污染状况、降尘量、降水量及降水中该元素含量的影响。硒、碘、氟三元素的挥发性与水迁移性的相互关系在很大程度上决定着我国四大地方病的分布。

SELENIUM, IODINE AND FLUORINE IN RAINWTAER AMD DUSTFALL IN CHINA

The contents of Se, I and F in rainwater and dustfall in different areas of China were measured and ranged from 0. 03 to 0. 59 ppb,0. 3 to 3. 8 ppb and 0.03 to 0.5 ppm in rainwater and from 0.50 to 4.04 ppm,2.46 to 6.21 ppm and 500 to 2275 ppm in dustfall, respectively. Of all factors affecting the contents, human activity is the dominant one and other factors identified include distance from sea, wind-blown sand and soil microorganism. The contents of three elements in dustfall collected by dust buckets were much higher than those in the topsoil and were mainly affected by air pollution, dustfall and rainfall amounts, and the element concentrations in the rainwater. The relationship between the volatilities and. migrating capacities of Se,I and F in water relates to the distribution of four endemic diseases in China to a great extent.