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中文摘要：
对贵阳地区2008年10月1日至2009年9月30日降水样品的SO4^2-含量和δ^34S值进行了测定。结果表明，研究时段内降水SO4^2-浓度为132mg／L，δ^34S值的变化范围为120‰～＋94‰，年均值为28‰±14‰，主要来源于燃煤释放的含硫物质。大气降水SO4^2-浓度和δ^34S值存在明显的季节性变化特征：冬季高，夏季低。SO4^2-浓度的季节性变化主要受降水量、污染来源的影响。δ^34S值的季节性变化，其主控制因素可能是同位素平衡分馏的温度效应，但还可能受水汽气团来源、生物活动和降水量等多方面的影响。贵阳燃煤释放SO，的δ^34S值比其他来源偏负，由于能源结构的调整和技术的改进，燃煤释放SO2量逐年下降，大气降水中δ^34S值逐年升高。
英文摘要：
This study analyzed the concentrations of SO4^2- and values of δ^34S in precipitation taken at Guiyang throughout one year from October 1, 2008 to September 30, 2009. The results indicated that the volume-weighted average concentration of SO2 in one year was 13.2 mg/L, and value of δ^34S was 2.8‰± 1.4‰ within range of 12.0‰ and ±9.4‰. Significant seasonal variations in SO4^2- concentration and δ^34S value, which are high in winter and low in summer, showed that SO4^2- concentration was affected by precipitation amount and pollutant sources, while δ^34S value was mainly affected by isotopic fractionation of equilibrium reaction, and may also by others such as coal combustion, air mass, biological activity, precipitation amount, and the oxidation of atmospheric sulfur. Because the δ^34S value of SO2 from coal combustion is more negative than other sources and the amount of SO2 declined each year, the δ^34S value in precipitation increased each year.
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