Sakkas Vasilios A, Lambropoulou Dimitra A, Albanis Triantafyllos A
Department of Chemistry, University of Ioannina, Greece.
Chemosphere. 2002 Sep;48(9):939-45. doi: 10.1016/s0045-6535(02)00121-2.
Photodegradation of chlorothalonil was studied in different natural waters (sea, river and lake) as well as in distilled water under natural and simulated solar irradiation. The effect of dissolved organic matter (DOM) such as humic and fulvic substances on the photodegradation rate of chlorothalonil was also studied in simulated sunlight. The presence of DOM enhanced the photodegradation of chlorothalonil with the exception of seawater. The kinetics were determined through gas chromatography electron capture detection (GC/ECD) and the photodegradation proceeds via pseudo-first-order reaction in all cases. Half-life ranged from 1 to 48 h. In natural and humic water chlorothalonil photodegradation gave rise to two different intermediates compared to distilled water demonstrating that the transformation of chlorothalonil depend on the constitution of the irradiated media and especially from DOM. The byproducts identified by GC/MS techniques were: chloro-1,3-dicyanobenzene, dichloro-1,3-dicyanobenzene, trichloro-1,3-dicyanobenzene and benzamide.
在天然和模拟太阳辐射条件下，研究了百菌清在不同天然水体（海水、河水和湖水）以及蒸馏水中的光降解情况。在模拟阳光下，还研究了腐殖质和富里酸等溶解有机物（DOM）对百菌清光降解速率的影响。除海水外，DOM的存在增强了百菌清的光降解。通过气相色谱电子捕获检测（GC/ECD）确定动力学，在所有情况下光降解均通过准一级反应进行。半衰期为1至48小时。与蒸馏水相比，在天然水和腐殖质水中百菌清光降解产生两种不同的中间体，这表明百菌清的转化取决于被辐照介质的组成，尤其是DOM的组成。通过GC/MS技术鉴定的副产物为：氯-1,3-二氰基苯、二氯-1,3-二氰基苯、三氯-1,3-二氰基苯和苯甲酰胺。
