Sándor M W
Department of General and Inorganic Chemistry, University of Veszprém, Hungary.
Acta Biol Hung. 1994;45(1):59-67.
Photochemical degradation of acetochlor--2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methyl-phenyl)- acetamid--was studied at ambient temperature. The herbicide was irradiated by UV-light in methanol and water-methanol solvent mixture. It was found that the photodecomposition of acetochlor obeys first order kinetics under the condition of photolysis. The half-life of the reactant was found as 1.2 h in water-methanol solvent mixture, while just half of that could be observed in pure methanol. The first step of the photolysis is the dehalogenation which is indicated by fast increasing of chloride concentration in the solution, and simultaneously an equivalent amount of protons is forming, too. The aromatic ring seems to be intact but the substituents connected to the nitrogen can be changed in many different ways. Among the photo-products 10 metabolites were identified by GC-MS method, they showed higher photochemical stability than the parent herbicide.
在环境温度下研究了乙草胺（2-氯-N-(乙氧基甲基)-N-(2-乙基-6-甲基苯基)乙酰胺）的光化学降解。该除草剂在甲醇和水-甲醇溶剂混合物中用紫外光照射。结果发现，在光解条件下乙草胺的光分解遵循一级动力学。在水-甲醇溶剂混合物中反应物的半衰期为1.2小时，而在纯甲醇中只能观察到其一半。光解的第一步是脱卤，这由溶液中氯离子浓度的快速增加表明，同时也形成等量的质子。芳环似乎完好无损，但与氮相连的取代基可以以许多不同方式发生变化。通过气相色谱-质谱法在光产物中鉴定出10种代谢物，它们表现出比母体除草剂更高的光化学稳定性。
