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

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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).

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Authors and Affiliations

  1. Faculty of Chemistry, Warsaw University, Pasteura 1, 02–093, Warsaw, Poland

    Agnieszka Krata, Krystyna Pyrzyńska & Ewa Bulska

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  1. Agnieszka Krata
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  2. Krystyna Pyrzyńska
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  3. Ewa Bulska
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Correspondence to Ewa Bulska.

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Krata, A., Pyrzyńska, K. & Bulska, E. Use of solid-phase extraction to eliminate interferences in the determination of mercury by flow-injection CV AAS. Anal Bioanal Chem 377, 735–739 (2003). https://doi.org/10.1007/s00216-003-2148-y

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  • DOI: https://doi.org/10.1007/s00216-003-2148-y

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