Sampling Indoor MVOCs by Solid-Phase Microextraction under Nonequilibrium Situation with Environmental Levels of BTEX

• Main Authors: Yen-Hua Chen, 陳燕嬅
• Other Authors: Shih-Wei Tsai
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/01248374986586308148

碩士 === 臺灣大學 === 環境衛生研究所 === 98 === Microbial volatile organic compounds (MVOCs) not only have potential adverse effects on human health but also could be the indictors for mold’s growth. Thus, measuring the indoor MVOCs level is important in respect to indoor air quality. Past research has shown the potential of MVOCs sampling by dynamic system with solid phase microextraction (SPME). However, possible competitive adsorption might occur when sampling in field, especially with the co-exist of other compounds (e.g., volatile organic compounds; VOCs). Therefore, the objective of this study was to examine if BTEX, the most abundant VOC indoors, will affect the dynamic sampling of MVOCs by SPME. The MVOCs and BTEX vapors were generated simultaneously in the exposure system in this study, while Carboxen/PDMS fiber was employed for the 40 min sampling. Afterwards, gas chromatography/mass spectrometry (GC/MS) was used for the analysis. The experimental sampling rates of MVOCs under different conditions were validated. The results showed that no competitive adsorption effects were observed when sampling MVOCs (4.24 μg/m3 to 149.31 μg/m3) by Carboxen/PDMS fiber for 40 minutes under nonequilibrium situation with the co-exist of indoor-level BTEX. Besides, the experimental sampling rate were found to be 0.0127±0.0040 cm3/s for 2-methyl-1-propanol, 0.0276±0.0010 cm3/s for 1-butanol, 0.0390±0.0017 cm3/s for 3-methyl-1-butanol, 0.0757±0.0021 cm3/s for 2-hexanone, 0.0771±0.0019 cm3/s for 2-heptanone, 0.0323±0.0015 cm3/s for 1-octan-3-ol, and 0.0587±0.0023 cm3/s for 2-pentylfuran, respectively. This study showed the potential to apply SPME under non-equilibrium condition for field MVOCs sampling.