Analytical and Bioanalytical Chemistry

, Volume 377, Issue 4, pp 735–739 | Cite as

Use of solid-phase extraction to eliminate interferences in the determination of mercury by flow-injection CV AAS

Original Paper

Abstract

Solid-phase extraction with two-step elution has been developed for effective elimination of copper and iron interference with mercury determination by flow-injection cold vapour atomic absorption spectrometry (CV AAS). Sodium tetrahydroborate(III) was used as reducing agent. Cation-exchanger Dowex 50Wx4 was applied for the sorption of mercury and both interfering ions. In the first step elution of Cu(II) and Fe(III) was performed using 0.5 mol L−1 KF solution. Then mercury was eluted with 0.1% thiourea in 8% HCl. The detection limit (3δ) for Hg(II) was 27 ng L−1. The expanded uncertainty estimated for the whole procedure was about 6%. The accuracy of the proposed method was evaluated by determination of the recovery of known amount of mercury added to mineral, spring, and tap waters, and by analysis of a certified reference material BCR-144R (sewage sludge).

Keywords

Mercury CV AAS Interferences Solid-phase extraction 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Agnieszka Krata
    • 1
  • Krystyna Pyrzyńska
    • 1
  • Ewa Bulska
    • 1
  1. 1.Faculty of ChemistryWarsaw UniversityWarsawPoland

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