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大气环境的硫同位素组成及示踪研究

, PP. 216-224

Keywords: 硫同位素,SO2,气溶胶,均相氧化,多相氧化

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Abstract:

?大气SO2和气溶胶硫酸盐是导致大气环境酸化,加剧酸沉降污染的重要因素.由于稳定硫同位素组成的“指纹”特征,硫同位素示踪技术已被广泛地应用到环境领域中的硫循环和硫源解析等研究.本文对浙江中部地区金华市的大气环境进行了连续的观测,并分析测定了大气SO2和气溶胶硫酸盐的硫同位素组成.结果表明,研究区域大气SO2的δ34S值变化范围是1.0‰~7.5‰,年均值为4.7‰±2.3‰,气溶胶?34S值变化范围是6.4‰~9.8‰,年均值为8.1‰±1.0‰.大气SO2的δ34S值存在明显的季节性变化特征,冬季为7.0‰,夏季为3.3‰,研究指出单一的控制因素并不能完全解释研究区域大气SO2硫同位素的季节性变化,认为同位素平衡分馏的温度效应和夏季富轻同位素的生物成因硫的大量释放可能是引起这种季节性变化的主要控制因素.另外,文中还讨论了大气SO2氧化形成硫酸盐的δ34S模式,认为在浙江中部地区大气SO2氧化反应中多相氧化处于主导地位,同时大气环境的相对湿度对大气SO2的氧化机制有着重要的影响.

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