Effects of humic substances on photodegradation of bensulfuron-methyl on dry soil surfaces
- Resource Type
- Article
- Authors
- Si, Youbin; Zhou, Jing; Chen, Huaiman; Zhou, Dongmei; Yue, Yongde
- Source
- Chemosphere. Sep2004, Vol. 56 Issue 10, p967-972. 6p.
- Subject
- *HERBICIDES
*SOILS
*HUMUS
*IRRADIATION
*FULVIC acids
- Language
- ISSN
- 0045-6535
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. [Copyright &y& Elsevier]