多势派氯代二噁在土壤表面的紫外光解研究  

THE UV PHOTODEGRADATION OF POLYCHLORINATED DIBENZO-p-DIOXINS ON THE SURFACE OF SOIL

作　　者：张志军[1] 郑明辉[1] 王克欧[1] 包志成[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《环境化学》1996年第6期541-546,共6页Environmental Chemistry

基　　金：国家自然科学基金

摘　　要：本文利用500W中压汞灯研究了二(口恶)(口英)在干燥土壤中的紫外光解.根据光解结果计算了土壤中二(口恶)(口英)的降解深度,并分析了五氯代二(口恶)(口英)(PeCDD)的光解产物.结果表明,二(口恶)(口英)在土壤表面发生了较快的光解反应,反应在2h内基本完成,降解深度为0.027mm.对PeCDD光解产物的分析结果显示,二(口恶)(口英)在土壤表面紫外光降解的主要途径为脱氯,而且脱氯优先发生在邻位上.A 500W medium pressure mercury lamp was applied in the research work of the photodegradation of polychlorinated dibenzo-p-dioxins in the dry soil. The depth of the photodegradation of dioxins in soil was calculated, and the products of the photodegradation of PeCDD were analyzed. Results showed that dioxins could be photodegradation on the surface of soil in a high reaction rate. The reaction was nearly finished within 2 hours. The depth of the photodegradation was 0. 027mm averagely. According to the results, the main path of the photodegradation was dechlorination, and the reaction occurred primarily at the peri- (1,4,8,9) positions.

关 键 词：多氯代二恶英 土壤 紫外光解 

分 类 号：X132[环境科学与工程—环境科学]