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Abstract
WHO-approved insecticides were co-intercalated with hexadecyl-trimethylammonium (HDTMA) chloride in bentonite in an attempt to improve their persistence. XRD and FT-IR 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% ℜH. 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 ranking with respect to both knockdown and mortality was as follows: Co-intercalated α-cypermethrin > co-intercalated propoxur > co-intercalated DDT > DDT.