摘要
研究了紫外光作用下六六六(α-HCH)在水、冰和雪3种介质中的光化学反应,考察了α-HCH的光化学反应动力学、产物和机理.结果表明,在水、冰和雪中,α-HCH均可以发生光化学反应,且反应均符合一级动力学方程.光化学反应速率大小顺序为雪>水>冰.在水和冰中,α-HCH均生成了异构化产物β-HCH和γ-HCH,异构化机理是α-HCH分子中的氯原子改变原来的构像;由于雪中α-HCH的光化学反应较快,因此在雪中未检测到异构化产物.在3种介质中,α-HCH的光解产物均为二氯苯和五氯环己烯,其机理为氯化氢或氯原子的脱除反应.
In this work, the photoconversion of α-HCH under UV irradiation was investigated in water, ice and snow. The photoconversion reaction kinetics, products and mechanisms were studied. The results showed that α-HCH could be photoconverted in water, ice and snow, and all the photoconversion reactions obeyed the first order kinetics equation. The photoconversion rate ofα-HCH was in the following sequence：snow＆gt;water＆gt;ice. The photoisomerization of α-HCH in water and ice generated β-HCH and γ-HCH, and the mechanisms were that the bonding of one or two chlorine atoms in α-HCH was changed. No isomerization products were detected in snow due to the fast photochemical reaction of α-HCH in snow. In the three media, the photolysis products were dichlorobenzene and penta-chlorocyclohexene, and the reaction schemes were the removal of chlorine atoms or hydrogen chloride.
出处
《环境化学》
CAS
CSCD
北大核心
2014年第8期1342-1346,共5页
Environmental Chemistry
基金
国家自然科学基金资助项目(41073063)
水体污染控制与治理科技重大专项子课题(2010ZX07320-003-004)资助
关键词
α-六六六
光化学
水
冰
雪
α-HCH
photochemistry
water
ice
snow
