以近連續方式量測空氣中異戊間二烯及其生成之季節性探討

In-situ On-site Measurement of Atmospheric Isoprene and Its Seasonal Variation

10.6623/chem.2002047

葉兆齡(Chao-Lin Yeh)；蔡政雄(Chen-Hsiung Tsai)；吳政修(Chen-Hsiu Wu)；王家麟(Jia-Lin Wang)

非甲烷碳氫化合物(NMHC) ； 異戊間二烯(2-methyl-1,3-butadiene；Isoprene) ； 日夜週期性變化(Diurnal cycle) ； Non-methane hydrocarbon (NMHC) ； Isoprene (2-methyl 1,3-butadiene) ； Diurnal cycle

化學

60卷3期（2002 / 09 / 01）

495 - 501

繁體中文

利用自組前濃縮(preconcentration)儀配合GC-FID，在夏季與秋末冬初兩個季節時段於中壢市中央大學校園內針對由排放因素主導濃度變化的物質異戊間二烯(isoprene)進行量測工作，量測結果證實夏季isoprene 和輻射強度與溫度有高度相依性，主要來源以植物排放為大宗，秋冬則因輻射減弱植物排放大量減少且空氣穩定性不佳，與輻射強度相關性不如夏季。吾人並在都市地區觀察到isoprene 由交通排放貢獻的事實。

An automated GC system consisted of a flame ionization detector (FID), a PLOT column, and a preconcentration trap was constructed for continuous monitoring ambient C3-C7 volatile organic compounds (VOCs). This system was placed on NCU campus for continuous measurement in different seasons: summer and late fall. Distinct diurnal cycles of isoprene were observed with mixing ratios peaking at noon, and becoming low and even close to zero in the evening. Excellent correlation was found in summer between the isoprene diurnal cycle and the strength of solar radiation. The major emission in summer was from plants. We demonstrated that the meteorological phenomena were the predominant factor in winter.