Publications by authors named "Feng-kui Duan"

Article Synopsis
  • Hydroxymethanesulfonate (HMS) is a prevalent organosulfur aerosol in the Beijing-Tianjin-Hebei region, peaking at 10 μg/m³ during winter haze.
  • The production methods of HMS in aerosols are debated, and the effectiveness of chemical transport models in predicting HMS variations during haze events is uncertain.
  • Modifications to the GEOS-Chem model reveal that about 36% of HMS in winter comes from aqueous aerosols, and projections indicate an increase in the HMS-to-inorganic sulfate ratio due to changes in emissions and atmospheric conditions from clean air policies.
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Based on the newly established high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD), the saccharides in PM2.5 and PM10 in Beijing from 2011 - 2012 were quantified. Fourteen saccharides were synchronously detected in the aerosols samples in Beijing, which can be divided into three categories, i.

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Recently, PM2.5 (atmospheric fine particulate matter with aerodynamic diameter ≤ 2.5 μm) have received so much attention that the observations, source appointment and countermeasures of it have been widely studied due to its harmful impacts on visibility, mood (mental health), physical health, traffic safety, construction, economy and nature, as well as its complex interaction with climate.

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Heavily-polluted PM₂.₅ (fine particulate matter) episodes frequently impacting Beijing, especially during winter, have become a substantial concern. We found that during winter, the daily variation of PM2.

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The chemical composition of Beijing aerosol was measured during summer and winter. Two distinct episodes were identified. Water-soluble potassium (K(+)) increased significantly during the firework episode in winter with an episode to non-episode ratio of 4.

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Ambient organic carbon (OC) to elemental carbon (EC) ratios are strongly associated with not only the radiative forcing due to aerosols but also the extent of secondary organic aerosol (SOA) formation. An inter-comparison study was conducted based on fine particulate matter samples collected during summer in Beijing to investigate the influence of the thermal-optical temperature protocol on the OC to EC ratio. Five temperature protocols were used such that the NIOSH (National Institute for Occupational Safety and Health) and EUSAAR (European Supersites for Atmospheric Aerosol Research) protocols were run by the Sunset carbon analyzer while the IMPROVE (the Interagency Monitoring of Protected Visual Environments network)-A protocol and two alternative protocols designed based on NIOSH and EUSAAR were run by the DRI analyzer.

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An intercomparison of organic carbon (OC) and elemental carbon (EC) measurements was conducted based on ambient aerosol samples collected during four seasons in Beijing, China. Dependence of OC and EC values on the temperature protocol and the charring correction method is presented and influences of aerosol composition are investigated. EC was found to decrease with the peak inert mode temperature (T(peak)) such that EC determined by the IMPROVE (the Interagency Monitoring of Protected Visual Environments)-A protocol (T(peak) was 580 °C) was 2.

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Total suspended particulates (TSP) samples were collected from Sep., 2003 to Jul., 2004 in Beijing, and 15 kinds of PAHs, ranging from 3 to 7 rings were analyzed.

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Article Synopsis
  • A new ion chromatography (IC) method was developed to measure twelve inorganic and fifteen organic ions in atmospheric aerosols simultaneously.
  • The method showed high accuracy with linear concentrations ranging from 0.005 to 500 microg/m3 and excellent precision (relative standard deviation from 0.43% to 2.00%).
  • It was successfully used to analyze PM2.5 samples from Beijing, detecting ions at very low limits (2.7 ng/m3 to 88 ng/m3).
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