Adsorption and Desorption of Triasulfuron by Soil

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• 作者：Alba Pusino ; Maria Giovanna Fiori ; Ilaria Braschi ; and Carlo Gessa
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2003
• 出版时间：August 27, 2003
• 年：2003
• 卷：51
• 期：18
• 页码：5350 - 5354
• 全文大小：64K
• 年卷期：v.51,no.18(August 27, 2003)
• ISSN：1520-5118

文摘

The adsorption and desorption of the herbicide triasulfuron [2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide] by three soils, soil organic matter (H⁺and Ca²⁺-saturated), and an amorphous iron oxide were studied. Adsorption isotherms conformedto the Freundlich equation. It was found that pH is the main factor influencing the adsorption in all ofthe systems. Indeed, the adsorption on soils was negatively correlated with pH. The highest level ofadsorption was measured on soils with low pH and high organic carbon content. Moreover, it wasfound that humic acid is more effective in the adsorption compared with calcium humate (the pHvalues of the suspensions being 3.5 and 6, respectively). Experiments on amorphous iron oxideconfirmed the pH dependence. Desorption was hysteretic on soils having high organic carbon content.Keywords: Triasulfuron; herbicide; adsorption; desorption; organic matter; montmorillonite; iron oxide