阿特拉津在土壤表面的紫外光解动力学及机理

Dynamics and mechanism of ultraviolet photolysis of atrazine on soil surface.

作者信息

Gong A, Ye C, Wang X, Lei Z, Liu J

机构信息

Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100 085, People's Republic of China.

出版信息

Pest Manag Sci. 2001 Apr;57(4):380-5. doi: 10.1002/ps.284.

DOI:10.1002/ps.284

PMID:11455818

Abstract

The photolysis of atrazine in the soil surface under UV light and the factors affecting this has been studied. A rate constant of 0.09-0.17 min-1, photolytic depth of 0.1-0.3 mm and half-life of 4-8 min were determined. The results show that soil granularity, pH, humidity, organic content, humic acid and surface-active agents could affect the photolysis of atrazine in soil. GC-MS showed three photolytic products: 1-sec-butyl-4,4-diethyl-1-tetrazene, N2,N4-diethyl-6-methyl-1,3,5-triazine-2,4-diamine and 6-chloro-N2-propyl-1,3,5-triazine-2,4-diamine. The mechanism of the photolytic process is discussed.

摘要

研究了紫外线照射下阿特拉津在土壤表面的光解作用及其影响因素。测定了光解速率常数为0.09 - 0.17 min⁻¹、光解深度为0.1 - 0.3 mm、半衰期为4 - 8 min。结果表明，土壤粒度、pH值、湿度、有机含量、腐殖酸和表面活性剂会影响阿特拉津在土壤中的光解。气相色谱 - 质谱联用仪检测到三种光解产物：1 - 仲丁基 - 4,4 - 二乙基 - 1 - 四氮烯、N₂,N₄ - 二乙基 - 6 - 甲基 - 1,3,5 - 三嗪 - 2,4 - 二胺和6 - 氯 - N₂ - 丙基 - 1,3,5 - 三嗪 - 2,4 - 二胺。并对光解过程的机理进行了讨论。