Spectrophotometric Determination of Some Organophosphorus Pesticides Based on Reaction With Cerium (IV) Sulfate
Keywords:
Spectrophotometry; Diazinon; Chlorpyrifos; Temefos; Cerium Sulphate; Methyl Orange.Abstract
A simple and sensitive spectrophotometric method has been described for the assay of some organophosphorus pesticides , (diazinon, chlorpyrifos and temefos) either in pure form or in dosage forms. The proposed method was based on the oxidation of the studied pesticides by a known excess of cerium (IV) sulfate in acidic medium and estimating the unreacted oxidizing agent by adding a known amount of methyl orange in the same acid medium and measuring the absorbance of the resulted solution at λmax=508 nm. Different variables affecting the reaction were studied and optimized. Beer’s law is obeyed in the concentration range of 1-8 µg ml-1 for diazinon and chlorpyrifos and 2-15 µg ml-1 for temefos. The proposed method was applied successfully for determination of the examined pesticides either in pure or dosage forms with good precision. No interferences were observed from excipients and the results obtained were in good agreement with those obtained using reported methods.
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