Highly Sensetive Reaction for the Estimation of Carbaryl Using 4‐4ˊ‐ Diaminodiphenyl Sulfone in Environmental Samples

Abstract

A rapid, sensitive Spectrophotometric method for the determination of ultra trace amount of carbaryl (1- Napthyl-N- Methyl Carbamate) is proposed. The method is based on an alkali hydrolysis of carbaryl in the presence of methanolic KOH, followed by coupling with diazotized 4-41- diaminodiphenyl sulfone in an alkaline medium. The water soluble pink dye obtained shows an absorption maximum at 540 nm. The system obeys Beer’s law over the range of 0.06-2.0μg mL-1. The absorptivity of the coloured product is 7.014 × 104l mol-1cm-1and the developed colour is stable for 48h. The detection limit of Carbaryl is 0.0102 μg mL-1. This method is a very good alternative tool and it can be used successfully for the determination of carbaryl residue in environmental water and grain samples.

Extractive spectrophotometric method for the determination of carbaryl in environmental samples

“…The acute oral LD 50 for rats is 850 mg/kg [4]. It has been reported that carbaryl causes alteration of liver microsomal enzymes, neurotoxicity, immunotoxic effects, histopathological changes in the testis, haemoatopoietic alterations [5][6][7][8][9]. The extensive use of this insecticide poses a serious risk to both the environment and the human health due to direct exposure or through residues in the food and drinking water [10].…”