Constituents of volatile organic compounds of evaporating essential oil
| Autor: | Ching-Yen Chen, Hsiu-Mei Chiang, Cho-Ching Lo, Hung-Lung Chiang, Hua-Hsien Chiu |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Atmospheric Science Thermogravimetric analysis Chemistry Fraction (chemistry) Toluene law.invention chemistry.chemical_compound Indoor air quality law Environmental chemistry Organic chemistry Volatile organic compound Benzene Chemical composition Essential oil General Environmental Science |
| Zdroj: | Atmospheric Environment. 43:5743-5749 |
| ISSN: | 1352-2310 |
| DOI: | 10.1016/j.atmosenv.2009.08.002 |
| Popis: | Essential oils containing aromatic compounds can affect air quality when used indoors. Five typical and popular essential oils—rose, lemon, rosemary, tea tree and lavender—were investigated in terms of composition, thermal characteristics, volatile organic compound (VOC) constituents, and emission factors. The activation energy was 6.3–8.6 kcal mol−1, the reaction order was in the range of 0.6–0.8, and the frequency factor was 0.01–0.24 min−1. Toluene, 1,2,3-trimethylbenzene, 1,2,4-trimethylbenzene, n-undecane, p-diethylbenzene and m-diethylbenzene were the predominant VOCs of evaporating gas of essential oils at 40 °C. In addition, n-undecane, p-diethylbenzene, 1,2,4-trimethylbenzene, m-diethylbenzene, and 1,2,3-trimethylbenzene revealed high emission factors during the thermogravimetric (TG) analysis procedures. The sequence of the emission factors of 52 VOCs (137–173 mg g−1) was rose ≈ rosemary > tea tree ≈ lemon ≈ lavender. The VOC group fraction of the emission factor of aromatics was 62–78%, paraffins were 21–37% and olefins were less than 1.5% during the TG process. Some unhealthy VOCs such as benzene and toluene were measured at low temperature; they reveal the potential effect on indoor air quality and human health. |
| Databáze: | OpenAIRE |
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