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Purge-and-Trap Gas Chromatography/Mass Spectrometry for the Analysis of Carboxylic Acids by Esterification

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Abstract

This report describes the application of purge-and-trap (P&T) gas chromatography/mass spectrometry (GC/MS) to analyze carboxylic acids (CAs) using esterification. The optimum analytical conditions were determined based on the esterification recoveries using 10 mmol L-1 of a CAs methanol solution. P&T sampling was carried out with a Curiepoint head-space sampler. The optimum instrumental conditions were: purging, 150°C for 10 min; trap temperature, - 10°C; desorption, 358°C for 20 s. A comparison of pyrolysis (Py)-GC/MS, P&T-GC/MS, and solvent extraction–GC/MS was made based on conversions of the CAs into the corresponding CA methylesters. The merits of the P&T method for the other two methods were validated according to quantitative data, the coefficient of variation, and the lower limit of determination calculated from the standard deviation. As a result, we concluded that the P&T method is more useful than the pyrolysis and solvent extraction methods.

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Authors and Affiliations

  1. Criminal Investigation Laboratory, Saitama Prefectural Police Headquarters, 15-1, Takasago 3-chome, Urawa, Saitama, 336-8533, Japan

    Yasushi Ehara

  2. Department of Environmental Science and Human Engineering, Graduate School of Science and Engineering, Saitama University, 255 Simo-okubo, Urawa, Saitama, 338-8570, Japan

    Kazuhiko Sakamoto

Authors
  1. Yasushi Ehara
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  2. Kazuhiko Sakamoto
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Ehara, Y., Sakamoto, K. Purge-and-Trap Gas Chromatography/Mass Spectrometry for the Analysis of Carboxylic Acids by Esterification. ANAL. SCI. 16, 283–286 (2000). https://doi.org/10.2116/analsci.16.283

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  • DOI: https://doi.org/10.2116/analsci.16.283

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