Abstract
Fifty-six volatile organic compounds (VOCs), known to be ozone precursors, were stored in three media (SUMMA and Silocan canisters and Tedlar bags) to evaluate their stability in these storage media. An analysis if samples of air followed the procedures described in the US EPA Method TO-15, and was performed using gas chromatograph (GC) equipped with a mass spectrometer (MS). The first-order decay model matched 87% of the observations. These 56 VOCs were classified into four groups-alkanes, alkenes, aromatics and biogenics. Alkenes and biogenics exhibited lower recovery rates than those of alkanes and aromatics. After a seven-day (7-d) storage period, 87% of alkenes could be recovered form canister storage and 82% were recovered from Tedlar bag storage. Isoprene, a major component in biogenic VOCs, exhibited a recovery rate of 75 ± 8% after storage for seven days in canisters and Tedlar bags. Storage conditions (humidity and temperature) affected the degradation constant of each VOC. The calculated average half-lifes of 56 VOCs for SUMMA conisters, Silcocan canisters, and Tedlar bags were 45 ± 6, 52 ± 6, and 37 ± 4 days, respectively. The VOCs stored in Tedlar bags had a lower recovery than stored in canisters.
Highlights
Many diverse media are used for collecting gaseous or whole air samples, including for example, stainless steel canisters and Tedlar bags.Different analytical methods may require different sampling media
This study extends previous studies on stability of compounds in storage, by assessing the storage stability of 56 VOCs stored in SUMMA
This study has investigated at two humidity levels (30 and 90% ) and two temperatures (25 and 35 °C), representative of environmental conditions in Taiwan island affect the stability and recovery of stored compounds
Summary
Many diverse media are used for collecting gaseous or whole air samples, including for example, stainless steel canisters and Tedlar bags. Different analytical methods may require different sampling media. The Compendium Method TO-14 targets 41 VOCs (U.S EPA, 1988). These compounds have been successfully stored in canisters over periods of several days to months at ppbv (parts per billion by volume) levels. TO-15 (U.S EPA, 1997) is used to measure 97. VOCs that represents 189 hazardous air pollutants (HAPs) listed in the Clean Air Act Amendment of
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