INTERACTIONS OF ALACHLOR WITH HOMOIONIC MONTMORILLONITES

被引:37
作者
BOSETTO, M [1 ]
ARFAIOLI, P [1 ]
FUSI, P [1 ]
机构
[1] CNR,CTR STUDIO COLLOIDI SULO,I-50144 FLORENCE,ITALY
关键词
D O I
10.1097/00010694-199302000-00004
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The adsorption of the herbicide Alachlor on montmorillonite saturated with different cations (Al3+, Cu2+, Ca2+, Mg2+ NH4+, Ne, Li+, Rb+, and Cs+) was studied in aqueous suspension. Equilibrium adsorption isotherms at 5-degrees and 22-degrees-C fit the Freundlich relationship. A correlation between adsorption and the polarizing power of the exchangeable cation was observed. A decrease in temperature from 22-degrees to 5-degrees-C resulted in an increase in adsorption except for Al-, Rb-, and Cs-montmorillonite. The isosteric heats of adsorption were also determined. The interaction of Alachlor with homoionic montmorillonites was also studied by FT-IR spectroscopy in an organic solvent. The results indicated that the molecule is adsorbed on monoionic montmorillonite by a coordination bond, through a water bridge, between C=O groups and the exchangeable cation of the clay. Further, the coordination strength is directly correlated with the polarizing power of the cation. X-ray diffraction analyses showed that the herbicide was able to penetrate the interlayer space of montmorillonite saturated with polyvalent cations. On moderate heating (70-degrees-C for 6 h) Alachlor adsorbed on Al-, Cu-, Ca-, Mg-, and NH4-clay is partially decomposed to 2-chloro-2',6'-diethylacetanilide.
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页码:105 / 113
页数:9
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