1. Determination of carboxylic acids in water by gas chromatography using several detectors after flow preconcentration
- Author
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Jurado-Sánchez, Beatriz, Ballesteros, Evaristo, and Gallego, Mercedes
- Subjects
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CARBOXYLIC acids , *WATER analysis , *GAS chromatography , *SOLID phase extraction , *DISINFECTION by-product , *MASS spectrometers , *CALIBRATION , *DRINKING water - Abstract
Abstract: A novel analytical method is reported that combines continuous solid-phase extraction and gas chromatography for the determination of 22 carboxylic acids in water. The highly polar and hydrophilic analytes were preferentially sorbed on a mixture of LiChrolut EN–Supelclean ENVI-18 (1:1) sorbent column and eluted with methanol; this extraction process did not require derivatisation. The extract was analysed by gas chromatography coupled to a flame ionisation detector as well as a mass spectrometer with electron impact (EI) or positive chemical ionisation modes. The highest sensitivity was achieved when using MS-EI, with good linearity in calibration curves and low detection limits (2–40ngL−1) for 50mL of sample. The entire procedure from raw aqueous sample to a ready-to-inject methanol solution of the acids requires less than 15min. Another benefit of this method is the good accuracy (recoveries between 93 and 102%) and precision (relative standard deviation, 3.4–6.2%), which allows the determination of carboxylic acids in environmental water and in real chlorinated and ozonated drinking water. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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