Metolachlor photodegradation study in aqueous media under natural and simulated solar irradiation
Metolachlor photodegradation study in aqueous media under natural and simulated solar irradiation
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DOI：
10.1021/jf048766w
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发表时间：
2005-02-09
影响因子：
6.1
通讯作者：
Albanis, TA
中科院分区：
文献类型：
--
作者：
Dimou, AD;Sakkas, VA;Albanis, TA
为阐明农药异丙甲草胺的光化学行为，研究了其在海水、河水、湖水和蒸馏水等不同组成的水介质中在自然光和模拟太阳光照射下的降解情况。此外，天然水的重要成分，如溶解性有机物（DOM，从Pamvotis湖分离）和硝酸根离子的影响也进行了研究。结果发现，在所有情况下，光降解都通过伪一级反应进行。DOM的存在抑制了光解反应，半衰期范围从87到693 In，而在NO3-的存在下，降解速率加快了11倍。此外，形成的降解产物（通常通过羟基化，脱烷基化和环化反应）的毒性也使用海洋发光细菌Vibrio degli进行。我们的研究结果表明，毒性增加的照射溶液表明，光产物的急性毒性作用更高的形成。
To elucidate the photochemical behavior of pesticide metolachlor, degradation was carried out in aqueous media of different compositions such as sea, river, lake, and distilled water under natural and simulated solar irradiation. In addition, the effect of important constituents of natural water such as dissolved organic matter (DOM, isolated from Pamvotis Lake) and nitrate ions was also examined. It was found that photodegradation proceeds via a pseudo-first-order reaction in all cases. The presence of DOM inhibits the photolysis reaction with half-lives ranging from 87 to 693 In whereas the degradation rate was accelerated up to 11 times in the presence of NO3-. In addition, the toxicity of the degradation products formed (generally through hydroxylation, dealkylation, and cyclization reactions) was also performed using the marine luminescent bacterium Vibrio fisheri. Our results indicated a toxicity increase of the irradiated solution showing that photoproducts of higher acute toxic effects were formed.