Co-intercalation of insecticides with hexadecyltrimethylammonium chloride in Mozambican bentonite

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Authors

Merckel, Ryan David
Focke, Walter Wilhelm
Sibanda, Mthokozisi Mayibongwe
Massinga, Pedro Horacio
Crowther, N.A.S. (Nicolaas Andries Sadie), 1944-

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Routledge

Abstract

WHO-approved insecticides were co-intercalated with hexadecyl-trimethylammonium (HDTMA) chloride in bentonite in an attempt to improve their persistence. XRD and FTIR confirmed successful co-intercalation of the insecticides. Bioassays revealed that the activity of co-intercalated insecticides deteriorated after just one week of accelerated aging at 40◦C and 90% H. However, when the pH of the bentonite slurry used for intercalation was reduced with acetic acid to pH = 4.5, the persistence life increased to 113 days. The performance rankingwith respect to both knockdown and mortality was as follows: Co-intercalated α-cypermethrin > co-intercalated propoxur > co-intercalated DDT > DDT.

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Keywords

Co-intercalated insecticides, Insecticide hydrolysis, Organo-clays

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Citation

R. D. Merckel, W. W. Focke, M. M. Sibanda, P. Massinga Jr & N. A. S. Crowther (2012): Co-Intercalation of Insecticides with Hexadecyltrimethylammonium Chloride in Mozambican Bentonite, Molecular Crystals and Liquid Crystals, 555:1, 76-84.