Measuring biogenic volatile organic compounds (BVOCs) from vegetation in terms of ozone reactivity

Jun Matsumoto*

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

A new system that uses the total reactivity with ozone (RO3) was developed for measuring biogenic volatile organic compounds (BVOCs) emitted from vegetation into the atmosphere. The decrease in ozone caused by the reaction with VOCs was monitored at the ppbv level by dual chemiluminescence detectors (CLDs) based on the NO-O3 reaction. Ozone was monitored by the dual CLDs before and after the reactor to correct for fluctuations in the ozone concentration. Such dual detectors can remove the interference caused by water vapor. A glass double-tube was adopted as the reactor. The loss rate of ozone to the wall was typically (6 ± 3) × 10-4 s-1. Gaseous cyclohexane was also added to the sample before it was introduced into the reactor to scavenge secondary OH radicals. From the characterization of the RO3 analyzer using the standard VOC sample the dependence of ozone reduction on the reaction time and reactivity were shown to agree with theoretical predictions. A calibration procedure for determining the reaction time was also established. Consequently the detection limit for RO3 in a 57-s reaction was determined to be 1.4 × 10-4 s-1 (S/N = 3) which corresponded to 27 ppbv of limonene. It was confirmed that the RO3 analyzer was capable of measuring BVOC levels. Finally a practical trial was conducted in which BVOCs emitted from a real needle-leaf tree were monitored. BVOC emissions from the tree were detected and a significant increase in RO3 was observed when the tree was irradiated with light.

本文言語English
ページ(範囲)197-206
ページ数10
ジャーナルAerosol and Air Quality Research
14
1
DOI
出版ステータスPublished - 2014 2

ASJC Scopus subject areas

  • 環境化学
  • 汚染

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