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HPLC online reductive scanning voltammetric detection of diquat, paraquat and difenzoquat with mercury electrodes

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Abstract

To establish an electrochemical HPLC detection system which is suitable for the voltammetric characterisation of unknown contaminants and food components at working potentials lower than –1 V, a modified flow-through cell for the use of a hanging mercury drop electrode (HMDE) is described. The introduction of silanised glass capillaries and a new flow-channel design provide a high HMDE lifetime, which is recommended in HPLC detection. As test system the herbicides diquat, paraquat and difenzoquat and ethylviologen as internal standard were measured using differential pulse voltammetry (DPV) detection to improve selectivity. Spiked water samples were analysed with voltammetric and UV-detection and results agreed well.

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Authors and Affiliations

  1. ZA für Chemische Analytik und Endokrinologie, Tierärztliche Hochschule Hannover, Bischofsholer Damm 15, D-30173 Hannover, Germany, , , , , , DE

    I. Rühling & W. Ternes

  2. Metrohm, CH-9100 Herisau, Switzerland, , , , , , CH

    H. Schäfer

Authors
  1. I. Rühling
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  2. H. Schäfer
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  3. W. Ternes
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Received: 12 November 1998 / Revised: 21 January 1999 / Accepted: 26 January 1999

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Rühling, I., Schäfer, H. & Ternes, W. HPLC online reductive scanning voltammetric detection of diquat, paraquat and difenzoquat with mercury electrodes. Fresenius J Anal Chem 364, 565–569 (1999). https://doi.org/10.1007/s002160051387

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  • DOI: https://doi.org/10.1007/s002160051387

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