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Sorption of Isoxaflutole and DKN on Organoclays

Published online by Cambridge University Press:  01 January 2024

Maria Jose Carrizosa ,
Pamela J. Rice ,
William C. Koskinen ,
Ignacio Carrizosa  and
Maria Carmen del Hermosin
Maria Jose Carrizosa
Affiliation:
USDA-ARS, Soil and Water Management Research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108, USA
Pamela J. Rice
Affiliation:
USDA-ARS, Soil and Water Management Research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108, USA
William C. Koskinen*
Affiliation:
USDA-ARS, Soil and Water Management Research Unit, 1991 Upper Buford Cir. Rm 439, St. Paul, MN 55108, USA
Ignacio Carrizosa
Affiliation:
Departamento de Quimica Inorganica, Facultad de Farmacia, C/Profesor García González S/N, 41012, Sevilla, Spain
Maria Carmen del Hermosin
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain
*
*E-mail address of corresponding author: koskinen@soils.umn.edu
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Abstract

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.

Keywords

DegradationDiketonitrileFreundlichHysteresisIsoxaflutoleOrganoclaysSorption
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 3 , June 2004 , pp. 341 - 349
Copyright
Copyright © 2004, The Clay Minerals Society

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