Thin-layer chromatographic detection of pyrethroid insecticides containing a nitrile group.
A spray reagent for the detection of pyrethroid insecticides containing a nitrile group by thin-layer chromatography is described. These insecticides on alkaline hydrolysis yield cyanide ion, which in turn reacts with copper(II) acetate and o-tolidine in an acetic acid medium to give a blue colour. Organochlorine, organophosphorus and carbamate insecticides do not interfere. The limit of detection is about 1 microgram.
Patil
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VB
Regional Forensic Science Laboratory, State of Maharashtra, Cantonment, Aurangabad, India.
Sevalkar
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MT
Padalikar
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SV
D002855:Chromatography, Thin Layer / Q000379:methods; D007202:Indicators and Reagents; D007306:Insecticides / Q000032:analysis*; D009570:Nitriles; D011722:Pyrethrins / Q000032:analysis*
D007202:Indicators and Reagents; D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C017160:cypermethrin; C017180:decamethrin; C017690:fenvalerate