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Determination of Hg(II) in Natural Waters by Diphenylation by Single-Drop Microextraction: GC

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Abstract

The purpose of the present work is to develop a simple, rapid, sensitive and accurate method for the derivatization and subsequently preconcentration of Hg(II) and the determination of its derivative, diphenylmercury, in natural water samples using gas chromatography-flame ionization detection. The method is based on the diphenylation using phenyl boronic acid, subsequent extraction of phenylmercury into a single drop of an organic solvent (toluene), followed by gas chromatography-flame ionization detection GC-FID analysis of the extract. The pH of the feed solution was kept in pH 5 with acetate buffer solution. Thus, the optimized conditions are: organic solvent, toluene; derivatization time, 10 min; extraction time, 15 min; microdrop volume, 1.6 μL; stirring rate, 600 rpm; sample volume, 5 mL. The limit of detection (LOD), calculated on the basis of five replicates was 0.02 μg mL−1. The relative standard deviation of the method (RSD%, n = 5) was 3.0. Linear range was between 0.05 and 5 μg mL−1 and preconcentration factor obtained for phenyl-mercury was 105.

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Acknowledgments

The authors wish to thank the Ferdowsi University of Mashhad, Iran, for financial support of this work.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

    Ali Sarafraz Yazdi & Solmaz Banihashemi

  2. Department of Chemistry, Faculty of Sciences, Payame Noor University, Mashhad, Iran

    Zarrin Es’haghi

  3. Biotechnology Research Center, Ferdowsi University of Mashhad, Mashhad, Iran

    Ali Sarafraz Yazdi & Zarrin Es’haghi

Authors
  1. Ali Sarafraz Yazdi
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  2. Solmaz Banihashemi
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  3. Zarrin Es’haghi
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Correspondence to Ali Sarafraz Yazdi.

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Sarafraz Yazdi, A., Banihashemi, S. & Es’haghi, Z. Determination of Hg(II) in Natural Waters by Diphenylation by Single-Drop Microextraction: GC. Chroma 71, 1049–1054 (2010). https://doi.org/10.1365/s10337-010-1576-z

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