Abstract
A simple selective and sensitive catalytic kinetic spectrophotometric method for the determination of trace amount of organophosphorus pesticides has been proposed. The method is based on the catalytic effect of organophosphorus pesticides (malathion, dimethoate and phorate) on the oxidation of LCV (leuco crystal violet) by potassium iodate in hydrochloric acid medium to give a violet colored dye. The dye shows maximum absorption at 592 nm. The fixed-time method was used for 15 min. The system obeys Beer’s law in the range of 0.02-0.2, 0.032-0.32 and 0.03-0.3 µg mL-1, for malathion, dimethoate, and phorate, respectively. Important analytical parameters such as time, temperature, reagent concentration, acidity etc, have been optimized for complete color reaction. Sandell’s sensitivity and molar absorptivity for the system were found to be 0.0002, 0.0004, 0.0004 µg cm-2 and 1.2 × 10(6), 5.21 × 10(5), 6.3 × 10(5) L mol-1cm-1, respectively. The proposed method was satisfactorily applied to micro-level determination of organophosphorus pesticides in vegetable samples.
Highlights
Organophosphorus pesticides are potentially hazardous substances widely used in agriculture due to their high insecticidal activity.[1]
Organophosphates are organic esters of phosphoric acid, thiophosphoric acid and other phosphoric acids.[2]. These pesticides are toxic for mammals due to the inhibition of the acetyl cholinesterase (AChE), an enzyme necessary for the normal function of the central nervous system.[3,4]
The method is based on the catalytic effect of organophosphorus pesticides on the oxidation of LCV by potassium iodate in acidic medium
Summary
Organophosphorus pesticides are potentially hazardous substances widely used in agriculture due to their high insecticidal activity.[1] Organophosphates are organic esters of phosphoric acid, thiophosphoric acid and other phosphoric acids.[2] These pesticides are toxic for mammals due to the inhibition of the acetyl cholinesterase (AChE), an enzyme necessary for the normal function of the central nervous system.[3,4] The pesticide residue causes serious health hazard, its ill effect can be reduced to minimum by detecting and controlling it.[5] A number
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