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Arsenic Determination in Marine Sediment Using Ultrasound for Sample Preparation

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Abstract

This work deals with As determination in marine sediment using ultrasound for sample preparation. It is shown that As can be quantitatively extracted from marine sediment using 20% (v/v) HCl and sonication. The slurry is centrifuged and the analyte is determined in the supernatant by hydride generation atomic absorption spectrometry (HG AAS). A flow injection (FI) system is employed for hydride generation, with 0.5% (m/v) NaBH4 used as reducdant and a 20% (v/v) HCl used as sample carrier. The limit of quantification is 1.6 μg g−1 of As, which is based on 800 μl of sample solution and 0.200 g of sample mass in a volume of 50 mL. Certified and non certified marine sediment samples were analyzed; the results were in accordance with the certified or reference values. Speciation analysis by HPLC-ICP-MS showed that As(V) is the only detectable As species present in the supernatant of the centrifuged sample.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, 91501-970, Porto Alegre, RS, Brasil

    Fabrina R. S. Bentlin & Dirce Pozebon

  2. Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brasil

    Fábio A. Duarte & Valderi L. Dressler

Authors
  1. Fabrina R. S. Bentlin
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  2. Fábio A. Duarte
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  3. Valderi L. Dressler
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  4. Dirce Pozebon
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Correspondence to Dirce Pozebon.

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Bentlin, F.R.S., Duarte, F.A., Dressler, V.L. et al. Arsenic Determination in Marine Sediment Using Ultrasound for Sample Preparation. ANAL. SCI. 23, 1097–1101 (2007). https://doi.org/10.2116/analsci.23.1097

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  • DOI: https://doi.org/10.2116/analsci.23.1097

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