NO_2^-存在条件下γ-六六六在冰中的光解动力学及机理  

The Photolysis Kinetics and Mechanism of Gamma-hexachlorocyclohexane in Ice with the Presence of Nitrite

作　　者：刘汉飞[1] 康春莉[1] 薛洪海[1,2] 何冲[1] 包思琪[1] 钟宇博 田涛[1] 

机构地区：[1]吉林大学环境与资源学院,长春130012 [2]吉林建筑大学松辽流域水环境教育部重点实验室,长春130118

出　　处：《科学技术与工程》2016年第14期9-11,共3页Science Technology and Engineering

基　　金：国家自然科学基金(41073063;41403101)资助

摘　　要：研究了模拟太阳光-NO_2^-作用下冰中γ-六六六(γ-HCH)的光解动力学和机理。结果发现,模拟太阳光-NO_2^-作用下冰中γ-HCH能够快速光解;且光解过程符合一级动力学方程。HCO_3^-和Fe^(3+)抑制了γ-HCH的光解;强酸性条件有利于γ-HCH的光解,中性及碱性条件影响不大。模拟太阳光-NO_2^-作用下冰中γ-HCH光解产物为一氯酚、四氯环己烯和五氯环己烯,主要光解机制为脱氯及羟基取代。研究结果对于深入认识亚硝酸根的光敏化作用以及γ-HCH的环境行为具有重要意义。The photolysis kinetics and mechanism of γ-HCH in ice by the simulated sunlight with the presence of nitrite was studied. The results showed thatγ-HCH photolysis occured in this system, and it obeyed the first-or-der kinetics. Dicarbonate and ferric ion inhibited the photolysis ofγ-HCH;the strong acidic condition was in favor of the photolysis, while neutral and alkaline conditions had little effect. The photolysis products ofγ-HCH detected were chlorophenol, tetrachlorocyclohexene and pentachlorocyclohexene, and the main photolysis mechanism was dechlorination and hydroxy substitution. The results help to understand the photosensitization of nitrite, as well as the environmental behavior of γ-HCH.

关 键 词：Γ-HCH 光解 冰相 NO2- 

分 类 号：O644.11[理学—物理化学]