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E-Journal of Chemistry
Volume 3, Issue 4, Pages 250-256

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

Besagarahally L. Bhaskara and Padmarajaiah Nagaraja

Department of Chemistry, University of Mysore, Manasagangotri, Mysore–570 006, India

Received 8 June 2006; Accepted 31 July 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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 × 104 l mol-1 cm-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.