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Sorption of isoxaflutole and DKN on organoclays

AuthorsCarrizosa, M. J.; Rice, P. J.; Koskinen, W. C.; Carrizosa, I.; Hermosín, M.C.
Issue Date2004
PublisherClay Minerals Society
CitationClays and Clay Minerals 52(3): 341-349 (2004)
AbstractSorption of the herbicide isoxaflutole and its main degradate, diketonitrile (DKN), to natural clays, SAz-1, SWy-2 and SHCa-l, 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.
Identifiersdoi: 10.1346/CCMN.2004.0520309
issn: 0009-8604
e-issn: 1552-8367
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