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Clays and Clay Minerals; June 2004; v. 52; no. 3; p. 341-349; DOI: 10.1346/CCMN.2004.0520309
© 2004 Clay Minerals Society
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SORPTION OF ISOXAFLUTOLE AND DKN ON ORGANOCLAYS

Maria Jose Carrizosa1, Pamela J. Rice1, William C. Koskinen1,*, Ignacio Carrizosa2 and Maria del Carmen Hermosin3

1 USDA-ARS, Soil and Water Management Research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108, USA
2 Departamento de Quimica Inorganica, Facultad de Farmacia, C/Profesor García González S/N, 41012, Sevilla, Spain
3 Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain

* E-mail address of corresponding author: koskinen{at}soils.umn.edu

Sorption of the herbicide isoxaflutole and its main degradate, diketonitrile (DKN), to natural clays, SAz-1, SWy-2 and SHCa-1, and the organoclay derivatives (octadecylammonium (ODA) and hexadecyltrimethylammonium (HDTMA)) of these clays was investigated. Isoxaflutole hydrolysis to DKN was too rapid in aqueous solutions with organoclays to characterize sorption. No measurable DKN sorption was observed for the natural clays. Sorption of DKN was greater on organoclays with an interlayer paraffin-like complex that were prepared from the high-charge SAz-1 clay than on organoclays with a bilayer or monolayer interlayer complex prepared using lower-charge SWy-2 or SHCa-1 clays. Desorption isotherms indicated that sorption was irreversible. For SAz-1 with HDTMA at ~100% of the clay CEC, the d001 values suggest that DKN enters the interlamellar space of the organoclay and dissociates into the anion. The DKN anion forms a very stable chelate complex with the residual cations and/or partially-coordinated structural cations. This strong interaction supports the irreversibility of the sorptive process.

Key Words: Degradation • Diketonitrile • Freundlich • Hysteresis • Isoxaflutole • Organoclays • Sorption




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X. Liu, X. Lu, R. Wang, H. Zhou, and S. Xu
INTERLAYER STRUCTURE AND DYNAMICS OF ALKYLAMMONIUM-INTERCALATED SMECTITES WITH AND WITHOUT WATER: A MOLECULAR DYNAMICS STUDY
Clays and Clay Minerals, December 1, 2007; 55(6): 554 - 564.
[Abstract] [Full Text] [PDF]


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