A comparison between two types of adsorbent tubes, the commonly used Tenax TA and a multi-sorbent bed (Carbotrap, Carbopack X, Carboxen 569) tube developed in our laboratory, has been done to evaluate their usefulness in the analysis of VOCs in ambient air. Duplicate indoor and outdoor samples of Tenax TA and multi-sorbent tubes of 10, 20, 40, 60 and 90l were taken in Barcelona city (Spain) on July and October of 2009. Breakthrough values (defined as %VOCs found in the back tube) were determined for all sampling volumes connecting two sampling tubes in series. The analysis was performed by automatic thermal desorption (ATD) coupled with capillary gas chromatography (GC)/mass spectrometry detector (MSD). Significant differences between the concentrations obtained-from multi-sorbent bed and Tenax TA tubes are observed for the very volatile compounds (56 degrees C

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Abstract. A methodology for identifying volatile organic compounds (VOC) and15 determining air quality in indoor air has been developed. The paper standardizes the 16 procedure of sampling and analysis for low concentration VOC air samples in buildings. 17The methodology is based in the activation of pump samplers by the inhabitants of the The concentrations of some individual VOC (ethanol, acetone, isopropanol, 1-butanol, 31 acetic acid, acetonitrile and 1-metoxy-2-propanol) were also higher than the expected

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