title: A novel method for the assessment of methyl parathion by using coupling agents in environmental and commercial samples.
abstract: 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 microg ml(-1) for 8-HQ and 0.5-6.0 microg 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.
authors.affiliation: Department of Chemistry, University of Mysore, Manasagangotri, Mysore, India. drpn58@yahoo.co.in
authors.forename: Padmarajaiah
authors.initials: P
authors.lastname: Nagaraja
authors.forename: Besagarahally L
authors.initials: BL
authors.lastname: Bhaskara
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002855:Chromatography, Thin Layer / Q000379:methods; D008743:Methyl Parathion / Q000032:analysis*; D015125:Oxyquinoline / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D008743:Methyl Parathion; D015125:Oxyquinoline