title: Extractive spectrofluorometric determination of quinalphos using fluorescein in environmental samples.
abstract: A simple, sensitive, convenient and low cost spectrofluorometric technique for determination of quinalphos is described. Quinalphos is decomposed with sodium ethoxide. Resultant sodium diethyl thiophosphate (Na-DETP) is extracted with a cationic fluorescein as ion pair complex into 1-chloro-2-nitrobenzene. The fluorescence of the ion pair, fluorescein-DETP is measured at 530 nm after excitation at 490 nm. This technique is applicable for the determination of quinalphos in water, food grains and vegetable samples up to ng level with Amberlite XAD-4.
authors.affiliation: Environmental Monitoring Laboratory, Department of Chemistry, S. V. University, Tirupati, Andhra Pradesh, India.
authors.forename: K
authors.initials: K
authors.lastname: Suvardhan
authors.forename: K Suresh
authors.initials: KS
authors.lastname: Kumar
authors.forename: P
authors.initials: P
authors.lastname: Chiranjeevi
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D019793:Fluorescein; D005456:Fluorescent Dyes; D005504:Food Analysis / Q000379:methods*; D007306:Insecticides / Q000032:analysis*; D009946:Organothiophosphorus Compounds / Q000032:analysis*; D012275:Oryza / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D014908:Triticum / Q000737:chemistry; D014675:Vegetables / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D005456:Fluorescent Dyes; D007306:Insecticides; D009946:Organothiophosphorus Compounds; D014874:Water Pollutants, Chemical; C009145:quinalphos; D019793:Fluorescein