Direct Determination of Polycyclic Aromatic Hydrocarbons in PM<sub>2.5</sub> by Thermal Desorption-GC/MS and Analysis of Their Diurnal/Seasonal Variations and Field Burning in Kumamoto

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  • 加熱脱着―GC/MSによるPM<sub>2.5</sub>中多環芳香族炭化水素類の直接分析と熊本における日内変動・季節変動や野焼きの解析
  • 加熱脱着―GC/MSによるPM_<2.5>中多環芳香族炭化水素類の直接分析と熊本における日内変動・季節変動や野焼きの解析
  • カネツ ダッチャク-GC/MS ニ ヨル PM ₂.₅ チュウ タカン ホウコウゾク タンカスイソルイ ノ チョクセツ ブンセキ ト クマモト ニ オケル ニチナイ ヘンドウ ・ キセツ ヘンドウ ヤ ノヤキ ノ カイセキ

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Abstract

In order to establish a simple and highly sensitive analytical method, thermal desorption followed by gas chromatography/mass spectrometry (TD-GC/MS) was investigated for polycyclic aromatic hydrocarbons (PAHs) in PM2.5. In this work, the TD condition was optimized for PAHs in filter samples, and the performance was compared with those by the solvent extraction method (SE). Even the TD method was much simpler, sensitivity is much higher compared to that of the SE method. TD-GC/MS was highly sensitive and PAHs could be detected with shorter sampling time. Accordingly, detailed seasonal variations were obtained with relatively shorter sampling time (1 – 3 days) for the long term. While the PM2.5 concentration changed in small ratio in different seasons, the PAH concentrations were much higher in the winter and spring when PAHs were largely emitted on the Chinese continent and transferred to Japan. The TD-GC/MS is highly sensitive, and a daily variation was obtained with a 4 h resolution. Furthermore the PAHs compositions emitted in the field burning could be determined just by sampling the air by driving a car for a half an hour through the burning grass field. The ratio of low molecular PAHs (3 – 4 rings) was higher in the field burning sample compared to those in PM2.5 sampled in Kumamoto-city for days. The TD-GC/MS is superior in both analytical cost and performance, and is expected to be used for many applications in atmospheric analysis and air monitoring.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 64 (8), 571-579, 2015

    The Japan Society for Analytical Chemistry

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