摘要
实验研究水溶液中二甲基硫（ＤＭＳ）的光化学氧化反应的动力学。结果表明，在入射光频率与强度一定条件下，ＤＭＳ进行光化学氧化反应的速率会受到介质、ｐＨ、重金属离子的影响。Ｈｇ２＋能显著加快人工海水介质中ＤＭＳ的光氧化速率。ＤＭＳ进行光氧化的一级速率常数为４．４６×１０－５～３０．４×１０－５ｓ－１，其在光照下的人工海水介质中的半寿期为３．６ｈ。
Kinetic study of photochemical oxidation reaction of DMS in aqueous solution was performed. The results show that the photooxidation reaction rates of DMS are influenced by the medium, pH and heavy metal ions. Hg 2+ can markedly accelerate the photooxidation rate of DMS in artificial seawater medium. The first order rate constants of DMS photooxidation reaction range from 4.46×10 -5 ￣30.4×10 -5 s -1 . Its half-life in light irradiated artificial seawater medium is 3.6 h. This suggests that photochemical process plays a very great role in influencing and controlling the concentration and distribution of DMS in seawater.
基金
国家"八五"攻关专题资助
关键词
海水
二甲基硫
二甲亚砜
光化学氧化
动力学
seawater
dimethylsulfide
dimethylsulfoxide
photochemical oxidation
kinetics
