Determination of the Release Mechanism of Polymer Supported Pesticides
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Date
1988-06
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Addis Ababa Universty
Abstract
The release mechanisms, of the two organophosphorus
insecticides, malathion and chlorpyrifos, were studied from
the polymer films prepared in the Laboratory. Furthermore,
the behaviour of the release of chlorpyrifos from the
granular commercial sample was also studied.
Thus, the diffusion of the insecticides from the
insecticidal polymer films; cellulose acetate impregnated
with chlorpyrifos, and cellulose acetate impregnated with
malathion, have shown the characterstic features of a
Fickian diffusion, at higher temperature ( 100° C ), and
the apparent diffusion coefficients have been calculated.
While, at temperatures lower than 100°c, the release has
shown a non-Fickian diffusion. On the other hand, the
release of chlorpyrifos from the polyethylene vinyl acetate
coplymer and the Suscon polymer films have shown a non-
Fickian diffusion at all the temperatures of study (70°c,
60°C, and 50°C).
Moreover, the release behaviour of the Suscon commercial
sample was studied at different conditions; in soil, water,
and open air. And the release was found to be dependent on
the concentration of the insecticide, raihfall and temperature
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Keywords
Release mechanisms