Pesticide Formulation, Deactivation of Mineral Carriers for Stable Heptachlor Dust Formulations

Abstract

4) Kittleson, A4. R., Anal. Chem. 24, 50% transmittance.With the absorbance of about 0.3, equivalent to 41, 3440-7 (1908).

Stability of Insecticide Formulations, The Use of Stabilizing Agents to Decrease Decomposition of Malathion on High-Sorptive Carriers

“…It has been reported (6) and shown in this study that the use of 7% of diethylene glycol is capable of changing the surface acidity of LVM attapulgite from less than 0.8 to 3.3, as measured by the method of Walling (73). Table IV shows that the use of 7% of diethylene glycol does not completely eliminate the malathion decomposition.…”

“…Treatment of LVM attapulgite with varying amounts (up to 8%) of Indusoil had no effect on the surface acidity as measured by the method of Walling (73). This would indicate that the mode of stabilization is other than the neutralization of surface acidity, as is indicated for the glycol deactivators (6,12).…”

“…® LVM = Low volatile matter (6-8% VM); RVM = Regular volatile matter (12-14% VM). 6 Volatile Matter is ignition loss, mostly water, driven off when material is heated at 1800°F. high (over 40%), reproducible results were difficult to obtain with duplicate samples.…”

“…This acid-site theory has also been proposed as the cause of decomposition of some thiophosphate insecticides; namely, malathion, parathion, and methyl parathion. Oxygencontaining compounds, such as glycols, reduce surface acidity (6). Such compounds have been proposed for use as stabilizers in dry formulations for phosphate insecticides (72).…”

Residue Reviews

“…The carrier may have a significant effect on the toxicant, such as degradation and deactivation (FoWKES et al 1960), so that selective inhibitors may be needed with certain carriers to prevent this (MALINA et al 1956). Volatile bases or basic acting substances such as urea or hexamethylenetetramine are used with acid clay surfaces.…”