Metsulfuron-methyl Sorption/Desorption Behavior on Volcanic Ash-Derived Soils. Effect of Phosphate and pH

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• 作者：Lizethly Cceres ; Roxana Fuentes ; Mauricio Escudey ; Edwar Fuentes ; Mara E. Bez
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2010
• 出版时间：June 9, 2010
• 年：2010
• 卷：58
• 期：11
• 页码：6864-6869
• 全文大小：735K
• 年卷期：v.58,no.11(June 9, 2010)
• ISSN：1520-5118

文摘

Metsulfuron-methyl sorption/desorption behavior was studied through batch sorption experiments in three typical volcanic ash-derived soils belonging to Andisol and Ultisol orders. Their distinctive physical and chemical properties are acidic pH and variable surface charge. Organic matter content and mineral composition affected in different ways sorption of metsulfuron-methyl (K_OC ranging from 113 to 646 mL g⁻¹): organic matter and iron and aluminum oxides mainly through hydrophilic rather than hydrophobic interactions in Andisols, and Kaolinite group minerals, as major constituents of Ultisols, and iron and aluminum oxides only through hydrophilic interactions. The Freundlich model described metsulfuron-methyl behavior in all cases (R² > 0.992). K_f values (3.1−14.4 μg^1−1/n mL^1/n g⁻¹) were higher than those reported for different class of soils including some with variable charge. Hysteresis was more significant in Ultisols. A strong influence of pH and phosphate was established for both kinds of soil, intensive soil fertilization and liming being the most probable scenario for leaching of metsulfuron-methyl, particularly in Ultisols.