Online Analysis of Water-soluble Acidic Gases and Anions in PM<sub>2.5</sub> at Tokushima City in Winter of 2015

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  • TOMIYASU Naoya
    Faculty of Pharmaceutical Sciences, Tokushima University
  • NAMIKAWA Makoto
    Faculty of Pharmaceutical Sciences, Tokushima University
  • TANAKA Hideji
    Faculty of Pharmaceutical Sciences, Tokushima University Institute of Biomedical Sciences, Tokushima University Graduate School
  • TAKEUCHI Masaki
    Faculty of Pharmaceutical Sciences, Tokushima University Institute of Biomedical Sciences, Tokushima University Graduate School

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Other Title
  • 2015年冬季の徳島市における水溶性酸性ガス及びPM<sub>2.5</sub>に含まれる陰イオンのオンライン分析
  • 2015年冬季の徳島市における水溶性酸性ガス及びPM2.5に含まれる陰イオンのオンライン分析
  • 2015ネン トウキ ノ トクシマシ ニ オケル スイヨウセイ サンセイ ガス オヨビ PM ₂.₅ ニ フクマレル インイオン ノ オンライン ブンセキ

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Abstract

This paper describes a simultaneous analytical system used for atmospheric water-soluble acidic gases and anions in PM2.5. The analytical system, consisting mainly of a parallel-plate wet denuder, mist chamber−hydrophobic filter based particle collector, and ion chromatograph provides automatically two acidic gas and two PM2.5 data with in one hour. We applied the system to the continuous measurement of air pollutants at Tokushima, Japan in the winter of 2015, and obtained meaningful data in 97.9 % of the sampling period. The average acidic gas concentration and anion concentration in the PM2.5 were, respectively, 4.85±3.08 nmol m−3 for HCl, 22.19±18.47 nmol m−3 for HONO, 9.54±2.52 nmol m−3 for HNO3, 101.57±71.99 nmol m−3 for SO2, 3.78±6.48 nmol m−3 for Cl−, 3.37±1.99 nmol m−3 for NO2−, 25.16±31.49 nmol m−3 for NO3−, and 92.61±55.33 nmol m−3 for SO42−. Characteristic diurnal patterns were observed in several gases. The concentration of HCl fluctuated with changes in the temperature with a 2-hour time-lag. The concentration of HONO peaked in the morning and middle of the night, and its behavior showed a similar pattern of NO2 concentration. Backward trajectory analysis suggested that a high concentration of SO2 that was emitted from China was transported to the sampling site, Tokushima, Japan.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 65 (8), 425-432, 2016

    The Japan Society for Analytical Chemistry

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