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Speciation of arsenite and arsenate by electrothermal AAS following ionic liquid dispersive liquid-liquid microextraction

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Abstract

We have developed a new method for the microextraction and speciation of arsenite and arsenate species. It is based on ionic liquid dispersive liquid liquid microextraction and electrothermal atomic absorption spectrometry. Arsenite is chelated with ammonium pyrrolidinedithiocarbamate at pH 2 and then extracted into the fine droplets of 1-butyl-3-methylimidazolium bis(trifluormethylsulfonyl) imide which acts as the extractant. As(V) remains in the aqueous phase and is then reduced to As(III). The concentration of As(V) can be calculated as the difference between total inorganic As and As(III). The pH values, chelating reagent concentration, types and volumes of extraction and dispersive solvent, and centrifugation time were optimized. At an enrichment factor of 255, the limit of detection and the relative standard deviation for six replicate determinations of 1.0 μg L−1 As(III) are 13 ng L−1 and 4.9 %, respectively. The method was successfully applied to the determination of As(III) and As(V) in spiked samples of natural water, with relative recoveries in the range of 93.3–102.1 % and 94.5–101.1 %, respectively.

Speciation of arsenite and arsenate by ionic liquid dispersive liquid-liquid microextraction - electrothermal atomic absorption spectrometry

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Acknowledgments

The authors would like to thank the German Research Foundation for base funding within the Emmy Noether program to Britta Planer-Friedrich (Grant PL 302/3-1). We would also like to thank Prof. Dr. Stefan Peiffer at University of Bayreuth for providing access to the instrumental (ETAAS) facility. Dr. Markus Bauer and Martina Rohr are gratefully acknowledged for their valuable suggestions on ETAAS analysis and Uwe Kunkel for providing river water samples.

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Authors and Affiliations

  1. Faculty of Chemistry, Shahid Beheshti University, 1983963113, Tehran, Iran

    Sasan Rabieh

  2. Environmental Geochemistry, Faculty of Biology, Chemistry and Earth Sciences, University of Bayreuth, Universitaetsstrasse 30, 95447, Bayreuth, Germany

    Sasan Rabieh

  3. Advanced Materials and Nanotechnology Department, Materials and Energy Research Center, Karaj, Iran

    Mozhgan Bagheri

  4. Environmental Geochemistry, Faculty of Biology, Chemistry and Earth Sciences, University of Bayreuth, Universitaetsstrasse 30, 95447, Bayreuth, Germany

    Britta Planer-Friedrich

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  1. Sasan Rabieh
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  2. Mozhgan Bagheri
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  3. Britta Planer-Friedrich
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Correspondence to Sasan Rabieh.

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Rabieh, S., Bagheri, M. & Planer-Friedrich, B. Speciation of arsenite and arsenate by electrothermal AAS following ionic liquid dispersive liquid-liquid microextraction. Microchim Acta 180, 415–421 (2013). https://doi.org/10.1007/s00604-013-0946-2

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