Adsorption and photo-reactivity of bensulfuron-methyl on homoionic clays

作者：Si YB^*; Wang SQ; Zhou DM; Chen HM

来源：Clays and Clay Minerals, 2004, 52(6): 742-748.

DOI：10.1346/CCMN.2004.0520609

• adsorption
• bensulfuron-methyl
• infrared spectroscopy
• kaolinite
• montmorillonite
• photolysis

The adsorption and photolysis of the herbicide bensulfuron-methyl [2-(4, 6-dimetboxypyrimidin-2-carbamoylsulfamoyl)-o-toluic acid methyl ester] on homoionic Na+-, Ca2+- and Fe3+- montmorillonite and kaolinite clays were studied. The Freundlich adsorption coefficient, K-f, measured from isotherms on clays followed the order Na+ < Ca2+ < Fe3+. Montmorillonite showed a greater adsorptive capacity than kaolinite. Analysis of Fourier transform infrared spectra of bensulfuron-methyl adsorbed on clay suggested probable bonding interactions between bensulfuron-methyl and homoionic clays. The photolysis rate of herbicide adsorbed on homoionic clay surfaces was quite slow to its free state and decreased in the order Na+ > Ca2+ > Fe3+, indicating that adsorption may have prevented photolysis.

• 出版日期2004-12
• 单位安徽农业大学