- 期刊
臺灣紅檜葉子BVOCs之動態釋出速率及其釋出量之估算
Estimation of Dynamic Emission Rate and Quantity of Bvocs from ＂Chamaecyparis Formosensis＂ Leaf
摘要
為了解紅檜（＂Chamaecyparis formosensis＂ Matsum.）葉子釋出生物性有機揮發化合物（Biogenic volatile organic compounds, BVOCs）的化學組成及其動態釋出速率，本研究利用3種方法，包括水蒸餾法、固相微萃取（Solid-phase microextraction, SPME）及原位採樣（＂in situ＂ sampling）萃取BVOCs成分，並以TD-GC-FID（Thermal desorption-gas chromatography-fl ameionization detector）及GC-MS（Gas chromatography-mass spectrometry）進行成分分析。水蒸餾法及SPME的試驗結果顯示，紅檜葉子釋出之BVOCs的主要成分為α-Pinene（＞65%）。原位採樣的試驗結果顯示，α-Pinene在白天的最大釋出速率175 ng hr^(-1)g^(-1)，而夜間則低於30 nghr^(-1)g^(-1)。進一步分析得知，α-Pinene的標準釋出速率與β值分別為0.06 μg hr^(-1)g^(-1)及0.12 K^(-1)。由此結果及紅檜葉子的生物量，可推估單株紅檜的α-Pinene釋出量為113 μg hr^(-1)tree^(-1)。本研究建立的原位採樣方法，除了可了解紅檜葉子在野外釋出之BVOCs外，還得到一些可估算紅檜葉子釋出BVOCs的參數，供作空氣品質監控或推廣森林遊憩之參考。
並列摘要
To understand the chemical composition of biogenic volatile organic compounds (BVOCs) emitted from leaf of ＂Chamaecyparis formosensis＂ Matsum. and estimate their dynamic emission rates, three methods including hydrodistillation, solid-phase microextraction (SPME) and in situ sampling were employed to extract BVOCs and analyzed by thermal desorptiongas chromatography-flame ionization detector (TD-GC-FID) and gas chromatography-mass spectrometry (GC-MS). Results from hydrodistillation and SPME demonstrated that α-pinene dominated (＞65%) in the BVOCs. Results from in situ sampling revealed that ＂C. formosensis＂ leaf emitted α-pinene at the maximum rate of 175 ng hr^(-1)g^(-1) in daytime and the rate lower than 30 ng hr^(-1)g^(-1) in nighttime. Further analysis showed that the standard emission rate and β coefficient of α-pinene were 0.06 μg hr^(-1)g^(-1) and 0.12 K^(-1), respectively. Combining these results with the estimated biomass of leaves from the ＂C. formosensis＂ sampled, the emission of α-pinene from this tree was estimated to be 113 μg hr^(-1) tree^(-1). The in situ sampling established in this study could gain our knowledge on the BVOCs emission in the field and obtain some coefficients for the estimation of BVOCs emission. These results could provide useful information for air quality control or promotion of forest recreation.
延伸閱讀
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