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Column-switching RPLC for the trace-level determination of ethylenethiourea in aqueous samples

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Summary

Column-switching with two C18 separation columns combined with UV detection at 233 nm has been used to determine ETU in ground water samples. The direct assay of ETU (limit of detection, 1 ppb) takes less than 10 min. For the determination of ETU down to a level of 0.1 ppb, preconcentration of ETU is achieved by a liquid-liquid extraction procedure allowing the analysis of at least 12 water samples per day.

For both methods (1-ppb and 0.1-ppb level), the overall recovery (96 and 82%), the repeatability (4.5 and 4.3%) and the reproducibility (5.0 and 7.9%) are satisfactory (n=18 and 28, respectively). More than one hundred samples of ground water were analysed during a 10-month period; over 0.1 ppb of ETU (range, 0.1–300 ppb) was found in 30% of the samples tested.

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Authors and Affiliations

  1. Laboratory of Organic Analytical Chemistry, National Institute of Public Health and Environmental Protection (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands

    E. A. Hogendoorn & P. van Zoonen

  2. Department of Analytical Chemistry, Free University, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands

    U. A. Th. Brinkman

Authors
  1. E. A. Hogendoorn
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  2. P. van Zoonen
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  3. U. A. Th. Brinkman
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Hogendoorn, E.A., van Zoonen, P. & Brinkman, U.A.T. Column-switching RPLC for the trace-level determination of ethylenethiourea in aqueous samples. Chromatographia 31, 285–292 (1991). https://doi.org/10.1007/BF02275752

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  • DOI: https://doi.org/10.1007/BF02275752

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