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Gas-chromatographic elemental analysis via di(trifluoroethyl)dithiocarbamatochelates

V. GC-Bestimmung von cr(VI) und Cr(III) in wÄ\riger Lösung nach extraktion als di(trifluorethyl)dithiocarbamat-chelat

Gas-chromatographische Elementanalyse mit Hilfe von Di(trifluorethyl)dithiocarbamat-Chelaten

V. Gas-Chromatographic Determination of Cr(VI) and Cr(III) in Aqueous Solution after Extraction as Di(trifluoroethyl)dithiocarbamate Chelate

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Zusammenfassung

Die Extraktion mit dem Reagens wird bei pH 3 durchgeführt. Als SÄulenmaterial hat sich am besten OV-25 (3% auf Chromosorb HPW, 100–120 mesh, 160–210‡ C) bewÄhrt. C28H58 wird als innerer Standard zugegeben. Noch 0.005 ppm Cr können bestimmt werden. Co, Ni, Zn, Cd, Cu, Fe(III) stören nicht. Pb verursacht Teilung, beeinflu\t jedoch nicht die Peakhöhe.

Summary

The gas-chromatographic determination of Cr(III) and Cr(VI) in aqueous solution using di(trifluoroethyl)dithiocarbamate as an extracting agent (pH 3) is described. Best results were obtained with a column of OV-25 (3% on Chromosorb HPW, 100–120 mesh, 160–210‡ C) C28H58 is added as an internal standard. As little as 0.005 ppm of Cr can be determined. Co., Ni, Zn, Cd, Cu, Fe(III) do not interfere. Pb causes tailing, but does not affect the peak height.

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Author notes

  1. A. P. Joshi

    Present address: Department of Chemistry, Nagpur University, 440010, Nagpur, India

Authors and Affiliations

  1. Inst. f. Anorg. Chem. u. Analyt. Chem., Johannes-Gutenberg-Univ., Postfach 3980, D-6500, Mainz, Bundesrepublik Deutschland

    A. P. Joshi & R. Neeb

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  1. A. P. Joshi
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  2. R. Neeb
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Additional information

We thankfully acknowledge the help by DFG (Deutsche Forschungsgemeinschaft) and Verband der Chemischen Industrie. One of the authors (APJ) thanks the Alexander von Humboldt-Stiftung, Bonn, for the award of a fellowship.

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Joshi, A.P., Neeb, R. Gas-chromatographic elemental analysis via di(trifluoroethyl)dithiocarbamatochelates. Z. Anal. Chem. 303, 389–393 (1980). https://doi.org/10.1007/BF00469997

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  • DOI: https://doi.org/10.1007/BF00469997

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