水相中羟基自由基诱导二甲基硫氧化的研究  

STUDY ON THE AQUEOUS HYDROXYL RADICAL INDUCED OXIDATION OF DIMETHYL SULFIDE

作　　者：房豪杰[1] 邵春雷[1] 陆晶[1] 侯惠奇[1] 

机构地区：[1]复旦大学环境科学研究所,上海200433

出　　处：《环境化学》2006年第2期133-136,共4页Environmental Chemistry

摘　　要：用激光闪光光解技术研究了水相中二甲基硫(DMS)与羟基自由基(·OH)的反应机理,并讨论了溶液pH值和O2对该反应的影响,进而比较了气液相DMS与·OH反应的不同,初步评估了由·OH氧化引起的海洋和大气液相中DMS的寿命．结果表明:在pH6-9时,·OH会与DMS反应生成·DMSOH,·DMSOH在水相中继续与DMS反应生成(DMS)2+,(DMS)2+与氧气的反应速度很慢,其衰减受pH影响较大．The reactions of dimethyl sulfide （DMS） with hydroxyl radical （· OH） in aqueous phase is studied by the Laser flash photolysis technique. Through the studies of the influence of pH and oxygen on the oxidation of DMS, we compared the difference of this reaction in aqueous and gas phases, therefore, lifetimes of DMS toward aqueous phase destruction via reactions with ·OH was assessed. The experiment results show that, at pH6-9, ·OH reacts with DMS to form ·DMSOH radical, which increasingly reacts with another DMS molecule to form （DMS）2^＋. The decay of （DMS）2^＋ ion is greatly influenced by the pH and its reaction with oxygen is immeasurably slow.

关 键 词：激光闪光光解 水相 二甲基硫 羟基自由基 

分 类 号：X132[环境科学与工程—环境科学]