Merckel, Ryan DavidFocke, Walter WilhelmSibanda, Mthokozisi MayibongweMassinga, Pedro HoracioCrowther, N.A.S. (Nicolaas Andries Sadie), 1944-2012-04-162013-03-282012-02R. 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, 76-84.1542-1406 (print)1563-5287 (online)10.1080/15421406.2012.634682http://hdl.handle.net/2263/18590WHO-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.en© Taylor & Francis Group, LLC. This is an electronic version of an article published in Molecular Crystals and Liquid Crystals, 555:1, 76-84. Molecular Crystals and Liquid Crystals is available online at: http://www.tandfonline.com/loi/gmcl20.Co-intercalated insecticidesInsecticide hydrolysisOrgano-claysPostprint Article