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A Novel Method for the Assessment of Methyl Parathion by Using Coupling Agents in Environmental and Commercial Samples
Author(s) -
Nagaraja Padmarajaiah,
Bhaskara Besagarahally L.
Publication year - 2007
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200790010
Subject(s) - chemistry , parathion methyl , chromophore , parathion , chromatography , coupling (piping) , nuclear chemistry , pesticide , photochemistry , mechanical engineering , agronomy , biology , engineering
A sensitive and rapid spectrophotometric method for the determination of reduced methyl parathion (= O , O ‐dimethyl O ‐(4‐nitrophenyl) phosphorothioate) is described. The method is based on the interaction of diazotized reduced methyl parathion with 8‐hydroxyquinoline (=quinolin‐8‐ol; 8‐HQ) and 3‐aminophenol (3‐AP) as new coupling agents. Absorbances of the resulting chromophores are measured at 430 and 440 nm, respectively, and colored products were stable for at least 2 days. Beer 's law is obeyed over the methyl parathion concentration range 0.2–5.5 μg ml −1 for 8‐HQ and 0.5–6.0 μg ml −1 for 3‐AP. From the data, it was confirmed that the two coupling agents can be effectively applied for the determination of methyl parathion in environmental and commercial samples.