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E-Journal of Chemistry
Volume 2, Issue 3, Pages 187-192

Extractive Spectrophotometric Determination of Malathion in Environmental Samples Using Gention Violet

K. M. Reddy,1 K. Suvardhan,2 K. Suresh Kumar,2 D. Rekha,2 and P. Chiranjeevi2

1Department of Chemistry, S. V. Arts College, Tirupati–517 502, India
2Environmental Monitoring Laboratories, Department of Chemistry, S.V.University, Tirupati-517 502, India

Received 21 March 2005; Accepted 10 May 2005

Copyright © 2005 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 new simple and selective spectrophotometric method is developed for the determination of malathion by using Gention violet is described. The method was based on the alkaline hydrolysis of malathion in presence of sodium ethoxide to form sodium dimethyl dithiophosphate (Na-DMDTP). The Na-DMDTP was formed as an ion-pair complex with cationic dye, gention violet. The ion-pair complex was extracted into chloroform. The color of the organic layer was measured at 587 nm. The method was applied to the determination of malathion residues in water, grain and soil samples