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Adsorption of metsulfuron and bensulfuron on a cationic surfactant-modified paddy soil.

作者：

Liao Min;Xie XiaoMei

单位：

;College of Environmental and Resource Sciences, Department of Resources Science, Zhejiang University, Hangzhou 310029, China.

关键词：

adsorption;bensulfuron;copper;equations;herbicide residues;metsulfuron;paddy soils;soil ph;soil types;sorption isotherms;surfactants

摘要：

Adsorption isotherms of metsulfuron and bensulfuron on a hexadecy ltrimethylammonium (HDTMA) bromide-modified paddy soil (in Zhejiang, China) under different ionic strengths, with divalent cation Cu2+, or having different pH were studied to describe their adsorptive behaviour, and to try to explain the adsorption process of a sulfonylurea compound with a carbamoylsulfamoyl group in the modified soil environment. All the adsorption isotherms fitted the Freundlich equation well, and the HDTMA treatment of paddy soil dramatically enhanced adsorption capacity of metsulfuron or bensulfuron. Also, an increase of ionic strength and the addition of divalent heavy metal cation Cu2+ on the HDTMA-modified paddy soil increased the adsorption of metsulfuron or bensulfuron. Additionally, for metsulfuron and bensulfuron in the aqueous phase, adsorption capacity of the HDTMA-modified paddy soil gradually increased with decreasing pH..

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Adsorption of metsulfuron and bensulfuron on a cationic surfactant-modified paddy soil.

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