Starch urea formaldehyde matrix encapsulation of solid agrochemicals. II. Release mechanism and release modeling

摘要

AbstractBased on experimental observation, a mechanism is proposed to describe the release of carbofuran from a starch‐UF matrix. A simple mathematical model is developed to describe the diffusion‐controlled release of a solid insecticide from a porous starch‐UF matrix undergoing both volume and surface erosions. The model is tested with the release data collected for different matrices and with different pH values of the environmental liquid. The comparison between the model predictions and data is found to be reasonably good. The model describes the release process at different pH values by accounting for the influence of pH on the erosion