Controlled Release of Carbofuran in Water from some Polymeric Matrices

Controlled release formulations of insecticide-nematicide carbofuran obtained through its monolithic dispersion/incorporation in sodium carboxy methyl cellulose, rosin-yellow, rosin-black, ethyl cellulose, polyvinyl acetate, cellulose acetate, poly vinyl alcohol, polyvinyl chloride, polystyrene, thermokol, bentonite, kaolinite, fullers’ earth, matrices released carbofuran in water beyond 63.0 days. The release of carbofuran was faster from biodegradable than synthetic matrices. Incorporation of clay in polymers slowed down the release. The release was diffusion controlled with a half release time of 7.5–60.3 days in water from different matrices. The period of optimum availability (maximum feasible concentration) of carbofuraa in water from controlled released formulations ranged from 9.0–67.5 days.