Spectrophotometric method of determination of carbofuran residues.

A method was developed for detn. of carbofuran residues based on hydrolysis with methanolic potassium hydroxide to carbofuran phenol, which on reaction with 4-amino-antipyrine in the presence of an alkaline oxidizing agent produces an orange colour dye with an absorption max. at 475 nm. The relationship between absorbance and concn. of carbofuran is linear in the range 0.5 to 20.0 mug/ml. Recovery of carbofuran from rice, wheat, jowar, pigeon pea, black gram and green gram when they were spiked with 30-240 mug of carbofuran ranged from 94.58 to 99.66%. The method can detect 0.3 p.p.m. of carbofuran in food grains.