Studies on the Discrimination of Sources of Sulfur in Air and their Behavior by Means of Isotopic Measurement of Biosulfur

对于“酸雨”的基础调查，需要辨别环境中硫化物或氮化合物的来源。该项目以硫的同位素测量为基础，以区分环境中硫化物的来源。作为第一步，进行了煤和石油中硫的同位素测量，这是环境中硫化物的主要人为来源。与硫磺的主要天然来源--海水硫酸盐相比，它们的增量值偏小。对空气、悬浮颗粒物、雨雪、树叶、食品和人体指甲等多种环境样品进行硫同位素测定。将其与化石燃料和海水硫酸盐的值进行了比较。可见，环境样品的34&S值反映了源区的值。该项目最重要的成果是利用树木叶片的34&gt；S值来估计环境中硫的来源。

For the basic investigation of "Acid Rain" the discrimination of the sources of sulfur or nitrogen compounds in the environment is required. This project is based on the isotopic measurement of sulfur to discriminate the sources of sulfur compounds in the environment. As the first step the isotopic measurement of sulfur in coals and petroleum which are the main anthropogenic sources of sulfur compounds in the environment was carried out. Their delta^<34>S values are less compared to that of seawater sulfate which is the main natural source of sulfur. Sulfur isotopic measurement of many kinds of environmental samples such as air, suspended particule matters, rain, snow, tree leaves, foods and human nails. Their delta^<34>S values are compared to those of fossil fuels and seawater sulfate. It becam clear that the delta^<34>S values of environmental samples reflect those of sources. The most important result of this project is that the use of delta^<34>S values of tree leaves is possible to estimate the source of sulfur in the environment.