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Abstract
A chromatographic paper impregnated with sodium hydroxide (test paper), when spotted with a carbaryl solution and dipped in 2,6-dichloroquinone-4-chloroimine (Gibbs reagent) in benzene, turns blue with a violet tinge. The colour formation is based upon the hydrolysis of carbaryl to give 1-naphthol which reacts with 2,6-dichloroquinone-4-chloroimine to produce indophenol that turns blue with a violet tinge in alkaline medium. The test paper can be successfully used for the detection and semi-quantitative determination of carbaryl at ppm levels in water.
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