[Determination of trace arsenic in sulfur by graphite furnace atomic absorption spectrometry with La(NO3)3-Ni(NO3)2 matrix modifier]

Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Feb;22(1):139-42.
[Article in Chinese]

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).

Publication types

  • English Abstract
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arsenic / analysis*
  • Lanthanum
  • Nickel
  • Spectrophotometry, Atomic / methods
  • Sulfur / chemistry*

Substances

  • lanthanide nitrate
  • nickel nitrate
  • Lanthanum
  • Sulfur
  • Nickel
  • Arsenic