Comparison of two solid-phase microextraction methods for the quantitative analysis of VOCs in indoor air |
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Authors: | Virginie Larroque Valérie Desauziers Pierre Mocho |
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Institution: | (1) Laboratoire Génie de l’Environnement Industriel, Ecole des Mines d’Alès, Hélioparc, 2 avenue Pierre Angot, 64053 Pau Cedex 9, France;(2) Laboratoire de Thermique Energétique et Procédés, Université de Pau et des Pays de l’Adour, B.P. 1155, 64000 Pau, France |
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Abstract: | Competitive adsorption on adsorptive solid-phase microextraction (SPME) fibres implies careful determination of operating
conditions for reliable quantitative analysis of VOCs in indoor air. With this objective, two analytical approaches, involving
non-equilibrium and equilibrium extraction, were compared. The average detection limit obtained for GC-MS analysis of nine
VOCs by the equilibrium method is 0.2 μg m−3, compared with 1.9 μg m−3 with the non-equilibrium method. The effect of the relative humidity of the air on the calibration plots was studied, and
shown to affect acetone adsorption only. Hence, the concentrations that can be accurately determined are up to 9 μmol m−3. The methods were then applied to indoor air containing different concentrations of VOCs. The non-equilibrium method, involving
short extraction time, can be used for detection of pollution peaks whereas equilibrium extraction is preferable for measurement
of sub-μg m−3 ground concentration levels.
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Keywords: | Solid-phase microextraction PDMS-Carboxen Indoor air Volatile organic compounds Humidity |
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