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ARS Home » Midwest Area » St. Paul, Minnesota » Soil and Water Management Research » Research » Publications at this Location » Publication #126352
Title: ADSORPTION OF THE INSECTICIDE IMIDACLOPRID ON NATURAL AND MODIFIED SMECTITES

Author
item COX, L
item HERMOSIN, M
item Koskinen, William
item CORNEJO, J

Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: 9/27/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Sorption of imidacloprid on organic saturated octadecylammonium, C18, and dioctadecyldimethylammonium, DOD, and inorganic (Fe) saturated montmorillonites which have high (SAz) and low (SWy) layer charge, has been investigated. Sorption isotherms were fitted to Freundlich equation. Imidacloprid-montmorillonite complexes were studied by X-Ray diffraction and FT-IR techniques. Imidacloprid sorption coefficients, Kf, decreased i the order C18SWy> C18SAz>FeSWy>DODSWy>=DODSAz. The low layer charge and saturation by primary alkylammonium cation facilitates sorption of imidacloprid in the interlayer of the smectite, which is corroborated by the increase in basal spacing observed in X-ray diffractograms and by the presence of shifted adsorption bands in FT-IR spectra. Imidacloprid sorbs in the interlayer space of smectite mainly by weak hydrophobic interactions and, in the case of primary alkylammonium saturated by polar bond between the NO2 group and NH of the alkylcation.