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Clays and Clay Minerals; December 2004; v. 52; no. 6; p. 742-748; DOI: 10.1346/CCMN.2004.0520609
© 2004 Clay Minerals Society
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ADSORPTION AND PHOTO-REACTIVITY OF BENSULFURON-METHYL ON HOMOIONIC CLAYS

Youbin Si1,*, Shenqiang Wang2, Dongmei Zhou2 and Huaiman Chen2

1 College of Resource and Environmental Science, Anhui Agricultural University, Hefei 230036, China
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

* E-mail address of corresponding author: youbinsi{at}21cn.com

The adsorption and photolysis of the herbicide bensulfuron-methyl [2-(4, 6-dimethoxypyr-imidin-2-carbamoylsulfamoyl)-o-toluic acid methyl ester] on homoionic Na+-, Ca2+- and Fe3+-montmorillonite and kaolinite clays were studied. The Freundlich adsorption coefficient, Kf, 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.

Key Words: Adsorption • Bensulfuron-methyl • Infrared Spectroscopy • Kaolinite • Montmorillonite • Photolysis






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