Effects of humic substances on photodegradation of bensulfuron-methyl on dry soil surfaces.
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.
Si
Youbin
Y
Department of Plant Protection, Anhui Agricultural University, Hefei 230036, China. youbinsi@21cn.com
Zhou
Jing
J
Chen
Huaiman
H
Zhou
Dongmei
D
Yue
Yongde
Y
D001578:Benzopyrans / Q000737:chemistry; D002681:China; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D010782:Photolysis; D012987:Soil; D017550:Spectroscopy, Fourier Transform Infrared; D013453:Sulfonylurea Compounds / Q000737:chemistry*
D001578:Benzopyrans; D006540:Herbicides; D006812:Humic Substances; D012987:Soil; D013453:Sulfonylurea Compounds; C071475:methyl bensulfuron; C005023:fulvic acid