title: A new catalytic oxidation method for sensitive quantification of bromate in flours and bottled water using AgNPs.
abstract: In this paper, a simple and sensitive spectrophotometric method for the determination of nanomolar level of bromate, based on the catalytic effect of silver nanoparticles on the oxidation of acid red 14 by potassium bromate, is described. The reaction rate was monitored spectrophotometrically by measuring the decrease in absorbance of acid red 14 at 516 nm. The detection limit of the method was 8 ng/mL, and the linear range was between 15 and 130 ng/mL. The effects of acidity, concentration of reactants and reaction time, and external ions were also discussed. The optimum reaction conditions were fixed, and some kinetic parameters determined. The relative standard deviation for the determination of bromate at the concentration of 50 ng/mL was calculated to be 0.996 % (n = 10). The method has been successfully applied to the determination of bromate in flours and bottled waters.
authors.affiliation: Departments of Chemistry, Hamedan Branch, Islamic Azad University, Hamedan, Iran, a.farmany@usa.com.
authors.forename: Abbas
authors.initials: A
authors.lastname: Farmany
authors.forename: Seyede Shima
authors.initials: SS
authors.lastname: Mortazavi
authors.forename: Ehsan
authors.initials: E
authors.lastname: Hashemi
authors.forename: Reza
authors.initials: R
authors.lastname: Sahraei
mesh_terms: D001959:Bromates / Q000032:analysis*; D002384:Catalysis; D060766:Drinking Water / Q000737:chemistry*; D004785:Environmental Pollutants / Q000032:analysis*; D005433:Flour / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*
chemical_list: D001959:Bromates; D060766:Drinking Water; D004785:Environmental Pollutants; D012834:Silver