title: The molecular resonance fluorescence method for determination of arsenic in hair samples.
abstract: A molecular resonance fluorescence quenching method for the determination of arsenic was proposed. The method is based on the quenching effect of As (V) on the molecular resonance fluorescence of Rhodamine B (RhB) in sulfuric acid medium and in the presence of molybdate and PVA. The influences of acidity, chemical and manifold variables on the sensitivity were studied. At the optimized conditions, the linear range for the determination of arsenic was 2.0x10(-3)-0.12microgml(-1) with the detection limit of 1.20x10(-9)gml(-1). The relative standard deviations for the eleven replicate determinations of 0.006microgml(-1) and 0.060microgml(-1) of arsenic were 1.12% and 1.61%, respectively. The proposed method was applied successfully for the determination of trace arsenic in hair samples with the recoveries of 94.8-104.6%.
authors.affiliation: University of South China, Hengyang, PR China. liguirong525@126.com
authors.forename: Guirong
authors.initials: G
authors.lastname: Li
authors.forename: Yunfu
authors.initials: Y
authors.lastname: Liu
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Lifu
authors.initials: L
authors.lastname: Liao
mesh_terms: D001151:Arsenic / Q000032:analysis*; D006197:Hair / Q000737:chemistry*; D006801:Humans; D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D013501:Surface-Active Agents; C044659:molybdate; D008982:Molybdenum; D001151:Arsenic