ABSTRACT:
Research Article
Highly Sensetive Reaction for the Estimation
of Carbaryl Using 4-4’- Diaminodiphenyl Sulfone
in Environmental Samples
BESAGARAHALLY L. BHASKARA and PADMARAJAIAH NAGARAJA*
Department of Chemistry
University of Mysore, Manasagangotri,
Mysore – 570 006, India
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 4-4'-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 0.06-2.0 μg ml-1. The absorptivity of the coloured product is 7.014 X 104 l mol-1cm-1 and 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.
