腐殖物质对苄嘧磺隆在干燥土壤表面光降解的影响。
Effects of humic substances on photodegradation of bensulfuron-methyl on dry soil surfaces.
作者信息
Si Youbin, Zhou Jing, Chen Huaiman, Zhou Dongmei, Yue Yongde
机构信息
Department of Plant Protection, Anhui Agricultural University, Hefei 230036, China.
出版信息
Chemosphere. 2004 Sep;56(10):967-72. doi: 10.1016/j.chemosphere.2004.04.059.
The photodegradation of the herbicide bensulfuron-methyl on dry soil surfaces in the presence and absence of humic substances was investigated under Xe lamp irradiation. A rapid rate of disappearance occurs in the humus-removed soil. The presence of humic acid (HA) and fulvic acid (FA) reduces degradation rates and has a quenching effect on the photodecomposition of bensulfuron-methyl. The quenching effect increases with increasing HA and FA concentration in soil. HA has a slightly greater ability to quenching the photolysis compared to FA. In addition, co-effects of HA and FA on quenching the photolysis are stronger than single effects of HA or FA.
在氙灯照射下，研究了在有和没有腐殖质存在的情况下，除草剂苄嘧磺隆在干燥土壤表面的光降解情况。在去除腐殖质的土壤中，苄嘧磺隆迅速消失。腐殖酸（HA）和富里酸（FA）的存在降低了降解速率，并对苄嘧磺隆的光分解有猝灭作用。猝灭作用随着土壤中HA和FA浓度的增加而增强。与FA相比，HA对光解的猝灭能力略强。此外，HA和FA对光解猝灭的协同作用强于HA或FA的单一作用。
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