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Dispersive Solid-Phase Extraction Followed by Triethylsilyl Derivatization and Gas Chromatography Mass Spectrometry for Perfluorocarboxylic Acids Determination in Water Samples

Monika Stróżyńska, Katrin Schuhen

J Chromatogr A. 2019 Jul 19;1597:1-8.

PMID: 30878177

Abstract:

A new, simple derivatization method for the determination of perfluorocarboxylic acids (PFCAs, C3-C12) in water is presented. The method is based on an acid-catalyzed esterification of perfluorinated carboxylic acids with triethylsilanol. During the reaction, a triethylsilyl ester is formed which can be easily analyzed by gas chromatography-mass spectrometry (GC-MS). The classic ion exchange solid phase extraction used for PFCAs (DIN 38407-42) has been significantly modified and adopted for the newly developed derivatization method. The new method offers a linear range from 8 to 10,000 ng l-1 for PFOA, with a limit of quantification ranging from 4 to 48 ng l-1 depending on the actual PFCA. Due to sample preparation simplicity, the presented method can be applied to form PFCAs esters prior to GC-MS analysis of water samples. The method was successfully applied in the analysis of effluents from two water treatment plants in Baden-Württemberg, Germany. Additionally, to confirm the laboratory evaluation, the standard solutions and samples were also measured by an external laboratory using LC-MS2.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP597524 Triethylsilanol Triethylsilanol 597-52-4 Price
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