title: Flow injection spectrophotometric determination of bromoxynil herbicide by diazotization method.
abstract: A flow injection spectrophotometric method is proposed for the determination of bromoxynil herbicide. Bromoxynil was hydrolyzed with HCl and the resulting product, 3,5-dibromo-4-hydroxyaniline, was diazotized with nitrite and coupled with aniline. The absorbance of the azo dye was measured at 500 nm. The conditions were optimized for diazotization using FIA. The range of linearity was found to be 0.01 to 5 ppm with a molar absorptivity of 1.27 x 10(5) L mol(-1) cm(-1). The % recovery for the determination of bromoxynil was found to be 91%. The sampling frequency was 80 samples per hour for FIA. The method is simple, fast, and has been successfully applied to the determination of bromoxynil in commercial formulations and food samples.
authors.affiliation: Department of Chemistry, University of Peshawar, N.W.E.P., Pakistan. mrjanpk2002@yahoo.com
authors.forename: M Rasul
authors.initials: MR
authors.lastname: Jan
authors.forename: Jasmin
authors.initials: J
authors.lastname: Shah
authors.forename: Nadia
authors.initials: N
authors.lastname: Bashir
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods; D006540:Herbicides / Q000032:analysis* / Q000737:chemistry; D015394:Molecular Structure; D009570:Nitriles / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D006540:Herbicides; D009570:Nitriles; C006826:bromoxynil