自動車排出ガス測定における高反応性揮発性有機化合物の消失 Decay of Labile Volatile Organic Compounds during the Measurement of Vehicle Exhaust

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Exhaust gases from vehicles under the various conditions were sampled, and the timeseries variations in the concentrations of volatile organic compounds (VOCs) in Tedlar bags and canisters were measured during 3 hours. Two gasoline vehicles and one diesel vehicle were tested by using a chassis dynamometer. Concentrations of 1,3-butadiene and styrene, of the eight VOCs that were monitored, often decreased rapidly after sampling. Under the most drastic condition, concentrations of 1,3-butadiene and styrene 3 hours after sampling were <10% of the initial concentrations. A second-order kinetics of 1,3-butadiene with nitrogen dioxide (NO<SUB>2</SUB>) fitted the decay of 1,3-butadiene in the exhaust samples under the various conditions. An adsorption method was evaluated in which samples were directly sampled and concentrated by an adsorption tube and analyzed immediately without using a bag or canister. Emission factors for VOCs other than 1,3-butadiene and styrene obtained by the adsorption method well agreed with the values obtained by using bags where samples were analyzed just after sampling. However, emission factors for 1,3-butadiene and styrene obtained by using bags were often <50 % of those determined by the adsorption method. It is suggested that the adsorption method can eliminate the underestimation of the labile compounds including 1,3-butadiene and styrene. Reported emission factors for labile compounds obtained by using bags or canisters could be underestimated, and care is needed when using such data.

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  • 環境化学 : journal of environmental chemistry

    環境化学 : journal of environmental chemistry 18(1), 51-64, 2008-03-18

    Japan Society for Environmental Chemistry

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各種コード

  • NII論文ID(NAID)
    10021084801
  • NII書誌ID(NCID)
    AN10547099
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09172408
  • NDL 記事登録ID
    9433519
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学) // ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z16-2322
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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