title: [Determination of trace arsenic in sulfur by graphite furnace atomic absorption spectrometry with La(NO3)3-Ni(NO3)2 matrix modifier].
abstract: In this paper, the decomposition method of sulfur and the determination of trace arsenic in sulfur by GFAAS with La(NO3)3-Ni(NO3)2 matrix modifier were studied in detail. The decomposition of sulfur with mixed acid HNO3-HClO4 by controlled temperature electrothermal method or pressure crucible method was efficient and safe. The sensitivity of the determination of arsenic with La(NO3)3-Ni(NO3)2 matrix modifier was higher than with Ni(NO3)2 or Mg(NO3)2 matrix modifiers. The detection limit was 0.034 microgram.mL-1 (k = 3). The analytical results of the sulfur samples were coincident with the results of determination by HG-ICP-AES. The adding recoveries were 97.5%-110% and the relative standard deviation was less than or equal to 2.1% (n = 4).
authors.affiliation: College of Chemsitry and Chemical Engineering, Guangxi University, Nanning 530004, China.
authors.forename: Jian-ling
authors.initials: JL
authors.lastname: Wu
authors.forename: Qi
authors.initials: Q
authors.lastname: Gong
authors.forename: Xian-guo
authors.initials: XG
authors.lastname: Wu
authors.forename: Lei
authors.initials: L
authors.lastname: Deng
authors.forename: Li-shu
authors.initials: LS
authors.lastname: Mo
authors.forename: Xiang-ming
authors.initials: XM
authors.lastname: Zheng
mesh_terms: D001151:Arsenic / Q000032:analysis*; D007811:Lanthanum; D009532:Nickel; D013054:Spectrophotometry, Atomic / Q000379:methods; D013455:Sulfur / Q000737:chemistry*
chemical_list: C016534:lanthanide nitrate; C035197:nickel nitrate; D007811:Lanthanum; D013455:Sulfur; D009532:Nickel; D001151:Arsenic