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Characteristics of 2-methyltetrols in ambient aerosol in Beijing, China
Abstract PM10 and PM2.5 samples were collected from November, 2010 to October, 2011 at Tsinghua University in Beijing. Various carbohydrates were quantified by high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC–PAD), including the 2-methyltetrols (2-methylthreitol and 2-methylerythritol). A clear seasonal variation in the ambient 2-methyltetrol concentrations was observed, with the highest levels occurring in the summer, followed by autumn, spring and winter. The average concentrations of the 2-methyltetrols in PM10 and PM2.5 were 17.5 ± 15.4 ng m− 3 and 13.8 ± 12.2 ng m− 3, respectively. The 2-methyltetrols exhibited significant positive correlations with ambient relative humidity and temperature, likely due to the higher isoprene emission strength and enhanced formation yield under higher temperature and humidity conditions. In contrast, there was no relationship between the concentration of 2-methyltetrols and sunshine duration. The significant positive correlation (R 2 = 0.76) between 2-methyltetrols and SO4 2 − indicated that high concentrations of SO4 2− can increase the formation rate of 2-methyltetrols from isoprene. Moreover, 2-methyltetrols were also observed in the winter time in Beijing, illustrating the enhancement of the 2-methyltetrol formation rate by high concentrations of pollutants in ambient aerosol.
Highlights ► First ambient aerosol measurements of 2-methyltetrols by HPAEC. ► A clear seasonal variation of 2-methyltetrol levels observed in PM2.5 and PM10. ► 2-Methyltetrols can still be detected during the winter in Beijing, China. ► Meteorological factors have various effects on the concentrations of 2-methyltetrols. ► Aerosol acidity may promote the formation of 2-methyltetrols in urban areas.
Characteristics of 2-methyltetrols in ambient aerosol in Beijing, China
Abstract PM10 and PM2.5 samples were collected from November, 2010 to October, 2011 at Tsinghua University in Beijing. Various carbohydrates were quantified by high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC–PAD), including the 2-methyltetrols (2-methylthreitol and 2-methylerythritol). A clear seasonal variation in the ambient 2-methyltetrol concentrations was observed, with the highest levels occurring in the summer, followed by autumn, spring and winter. The average concentrations of the 2-methyltetrols in PM10 and PM2.5 were 17.5 ± 15.4 ng m− 3 and 13.8 ± 12.2 ng m− 3, respectively. The 2-methyltetrols exhibited significant positive correlations with ambient relative humidity and temperature, likely due to the higher isoprene emission strength and enhanced formation yield under higher temperature and humidity conditions. In contrast, there was no relationship between the concentration of 2-methyltetrols and sunshine duration. The significant positive correlation (R 2 = 0.76) between 2-methyltetrols and SO4 2 − indicated that high concentrations of SO4 2− can increase the formation rate of 2-methyltetrols from isoprene. Moreover, 2-methyltetrols were also observed in the winter time in Beijing, illustrating the enhancement of the 2-methyltetrol formation rate by high concentrations of pollutants in ambient aerosol.
Highlights ► First ambient aerosol measurements of 2-methyltetrols by HPAEC. ► A clear seasonal variation of 2-methyltetrol levels observed in PM2.5 and PM10. ► 2-Methyltetrols can still be detected during the winter in Beijing, China. ► Meteorological factors have various effects on the concentrations of 2-methyltetrols. ► Aerosol acidity may promote the formation of 2-methyltetrols in urban areas.
Characteristics of 2-methyltetrols in ambient aerosol in Beijing, China
Liang, Linlin (author) / Engling, Guenter (author) / Duan, Fengkui (author) / Cheng, Yuan (author) / He, Kebin (author)
Atmospheric Environment ; 59 ; 376-381
2012-05-30
6 pages
Article (Journal)
Electronic Resource
English