摘要
实验研究水溶液中二甲基硫（ＤＭＳ）和Ｈ２Ｏ２进行氧化反应的动力学。结果表明ＤＭＳ被Ｈ２Ｏ２氧化的速率会受到介质、ｐＨ以及重金属离子的影响。其二级反应速率常数为２．２１×１０－２～４．９０×１０－２Ｌ·ｍｏｌ－１·Ｓ－１．Ｈｇ２＋的存在会加快反应速率，特别在人工海水条件下十分明显。ＤＭＳ易被Ｈ２Ｏ２氧化的事实说明。
Kinetics of oxidation reaction between dimethylsulfide (DMS) and H 2O 2 in aqueous solution is studied in this paper. The results show that the oxidation rate of DMS by H 2O 2 is affected by medium, pH, and heavy metal ions. The second order rate constants of DMS oxidation by H 2O 2 rang from 2.21×10 -2 ￣4.90×10 -2 L·mol -1 ·S -1 . The oxidation reaction rate is speeded up in the presence of Hg 2+ , which is especially apparent in artificial seawater medium. The fact that DMS is readily oxidzed by H 2O 2 proposes that chemical oxidation process in seawater produces an important impact on the concentration and distribution of DMS.
基金
国家"八五"攻关专题
关键词
海水
二甲基硫
过氧化氢
化学氧化
动力学
seawater
dimethylsulfide
hydrogen peroxide
chemical oxidation
kinetics
