二甲基硫醚光解及二甲基二硫醚生成速率研究  

Study on the Photolysis of Dimethyl Sulfide and the Rate Constant of Forming Dimethyl Disulfide

作　　者：钟晋贤[1] 杨文襄[1] 牟玉静[1] 李哲[1] 陈大舟 

机构地区：[1]中国科学院生态环境研究中心,中国标准物质研究中心

出　　处：《环境科学》1994年第5期27-30,共4页Environmental Science

基　　金：国家自然科学基金

摘　　要：用低压汞灯照射二甲基硫醚（ＤＭＳ），在２０ｍ的长光池中用富里叶红外光谱仪测量其光解产物，结果表明二甲基硫醚光解生成二甲基二硫醚（ＤＭＤＳ）和乙烷。测量其不同光照时间的光解产物，结果表明在直角坐标上是一条直线，说明了二甲基二硫醚生成按一级反应进行，其生成的速率常数为８．７０×１０－５ｓ－１。用低压汞灯照射ＤＭＳ＋Ｈ２Ｏ２体系，富里叶红外光谱检测其产物，在有足够的Ｈ２Ｏ２情况下，生成了ＣＨ２Ｏ和ＣＨ３ＳＯ３。在辐照ＤＭＳ＋ＮＯ体系时，富里叶红外光谱仪检测产物为ＣＨ３ＳＳＣＨ３，Ｃ２Ｈ６和ＣＨ３ＳＮＯ，探讨了其反应机理。Dimethyl sulfide (DMS) was irradiated with a low pressure mercury lamp and then the photolytic products were defected with a Fourier transform infrared spectroscope in a long path cell of 20m at different times. The results show that dimethyl sulfide was photolyzed to form dimethyl disulfide and ethane by following a first order reaction,with a rate constant of 8. 70 × 10￣(-5)s￣(-1) for the formation of dimethyl disulfide. A system of DMS +H_2O_2 and a system of DMS+NO were also studied by using the same method. It was found that in the presence of sufficient H_2O_2,DMS was photolyzed to form CH_2O and CH_3SO_3H. In the case of DMS + NO, the photolytic products were CH_3SSCH_3, C_2H_6 and CH_3SNO.

关 键 词：光解 二甲基硫醚 二甲基二硫醚 生成常数 

分 类 号：X13[环境科学与工程—环境科学]