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| 1 | Chemical characteristics of PM_(2.5) during a typical haze episode in Guangzhou显示文摘The chemical characteristics(water-soluble ions and carbonaceous species) of PM2.5 in Guangzhou were measured during a typical haze episode.Most of the chemical species in PM2.5 showed significant difference between normal and haze days.The highest contributors to PM2.5 were organic carbon(OC),nitrate,and sulfate in haze days and were OC,sulfate,and elemental carbon(EC) in normal days.The concentrations of secondary species such as,NO3-,SO42-,and NH4+ in haze days were 6.5,3.9,and 5.3 times higher than those in normal days,respectively,while primary species(EC,Ca2+,K+) show similar increase from normal to haze days by a factor about 2.2-2.4.OC/EC ratio ranged from 2.8 to 6.2 with an average of 4.7 and the estimation on a minimum OC/EC ratio showed that SOC(secondary organic carbon) accounted more than 36.6% for the total organic carbon in haze days.The significantly increase in the secondary species(SOC,NO3-,SO42-,and NH4+),especially in NO3-,caused the worst air quality in this region.Simultaneously,the result illustrated that the serious air pollution in haze episodes was strongly correlated with the meteorological conditions.During the sampling periods,air pollution and visibility had a good relationship with the air mass transport distance;the shorter air masses transport distance,the worse air quality and visibility in Guangzhou,indicating the strong domination of local sources contributing to haze formation.High concentration of the secondary aerosol in haze episodes was likely due to the higher oxidation rates of sulfur and nitrogen species. | TAN Jihua DUAN Jingchun HE Kebin MA Yongliang DUAN Fengkui CHEN Yuan FU Jiamo | 2009 | Journal of Environmental Sciences2009，21，6： | 71 |
| 2 | Air pollution characteristics and their relationship with emissions and meteorology in the Yangtze River Delta region during 2014–2016显示文摘With rapid economic growth and urbanization, the Yangtze River Delta(YRD) region in China has experienced serious air pollution challenges. In this study, we analyzed the air pollution characteristics and their relationship with emissions and meteorology in the YRD region during 2014–2016. In recent years, the concentrations of all air pollutants, except O3,decreased. Spatially, the PM2.5, PM10, SO2, and CO concentrations were higher in the northern YRD region, and NO2 and O3 were higher in the central YRD region. Based on the number of non-attainment days(i.e., days with air quality index greater than 100), PM2.5 was the largest contributor to air pollution in the YRD region, followed by O3, PM10, and NO2.However, particulate matter pollution has declined gradually, while O3 pollution worsened.Meteorological conditions mainly influenced day-to-day variations in pollutant concentrations. PM2.5 concentration was inversely related to wind speed, while O3 concentration was positively correlated with temperature and negatively correlated with relative humidity.The air quality improvement in recent years was mainly attributed to emission reductions.During 2014–2016, PM2.5, PM10, SO2, NOx, CO, NH3, and volatile organic compound(VOC)emissions in the YRD region were reduced by 26.3%, 29.2%, 32.4%, 8.1%, 15.9%, 4.5%, and0.3%, respectively. Regional transport also contributed to the air pollution. During regional haze periods, pollutants from North China and East China aggravated the pollution in the YRD region. Our findings suggest that emission reduction and regional joint prevention and control helped to improve the air quality in the YRD region. | Tao Ma Fengkui Duan Kebin He Yu Qin Dan Tong Guannan Geng Xuyan Liu Hui Li Shuo Yang Siqi Ye Beiyao Xu Qiang Zhang Yongliang Ma | 2019 | Journal of Environmental Sciences2019，31，9： | 26 |
| 3 | Characteristics and source identification of fine particulate n-alkanes in Beijing, China显示文摘Ambient particulate n-alkanes were determined for fine particle (PM2.5) samples collected from Sep 2003 to July 2004 in Beijing, China. The average concentration of total n-alkanes ( n-alkanes) from C11 to C34 was 425.72 ng/m3, ranged from 7.02 to 2893.28 ng/m3. The concentration distributions of n-alkanes homologues in this study exhibited peaks at C21 and C29 in heating season, and C29 in non-heating season. The average carbon preference index (CPI) value was 1.88 in the range of 1.18-3.88. The maximum CPI in summer indicated the contribution of biogenic origins such as plant wax; while the minimum CPI value in winter was probably a result of fossil fuel combustion. Preliminary estimation from these results showed that 59% of the n-alkanes in PM2.5 in Beijing summer originated from plant wax, while 74%-88% was from fossil fuel combustion in other three seasons. Source estimation was further performed using principal component analysis method. Two major components were yielded accounting for 57.3% and 30.9% of the total variance, which presented the fossil fuel and biogenic contribution, respectively. | Fengkui Duan Kebin He Xiande Liu | 2010 | Journal of Environmental Sciences2010，22，7： | 11 |
| 4 | Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy显示文摘Fine particles associated with haze pollution threaten the health of more than 400 million people in China. It is therefore of great importance to thoroughly investigate and understand their composition. To determine the physicochemical properties in atmospheric fine particles at the micrometer level, we described a sensitive and feasible surface-enhanced Raman scattering(SERS) method using Ag foil as a substrate. This novel method enhanced the Raman signal intensities up to 10,000 a.u. for ν(NO_3^-) in fine particles.The SERS effect of Ag foil was further studied experimentally and theoretically and found to have an enhancement factor of the order of ~10~4. Size-fractionated real particle samples with aerodynamic diameters of 0.4–2.5 μm were successfully collected on a heavy haze day,allowing ready observation of morphology and identification of chemical components, such as soot, nitrates, and sulfates. These results suggest that the Ag-foil-based SERS technique can be effectively used to determine the microscopic characteristics of individual fine particles, which will help to understand haze formation mechanisms and formulate governance policies. | Zhenli Sun Fengkui Duan Kebin He Jingjing Du Liu Yang Hui Li Tao Ma Shuo Yang | 2019 | Journal of Environmental Sciences2019，31，1： | 9 |
| 5 | Characteristics of carbonaceous aerosols in Beijing, China显示文摘 | Fengkui Duan Kebin He Yongliang Ma Yingtao Jia Fumo Yang Yu Lei S. Tanaka T. Okuta | 2005 | Chemosphere2005，，3： | 3 |
| 6 | Surface-enhanced Raman scattering for mixing state characterization of individual fine particles during a haze episode in Beijing,China显示文摘The nondestructive characterization of the mixing state of individual fine particles using the traditional single particle analysis technique remains a challenge.In this study,fine particles were collected during haze events under different pollution levels from September 5 to 112017 in Beijing,China.A nondestructive surface-enhanced Raman scattering(SERS)technique was employed to investigate the morphology,chemical composition,and mixing state of the multiple components in the individual fine particles.Optical image and SERS spectral analysis results show that soot existing in the form of opaque material was predominant during clear periods(PM_(2.5)≤75μg/m^(3)).During polluted periods(PM_(2.5)>75μg/m^(3)),opaque particles mixed with transparent particles(nitrates and sulfates)were generally observed.Direct classical least squares analysis further identified the relative abundances of the three major components of the single particles:soot(69.18%),nitrates(28.71%),and sulfates(2.11%).A negative correlation was observed between the abundance of soot and the mass concentration of PM_(2.5).Furthermore,mapping analysis revealed that on hazy days,PM_(2.5)existed as a core-shell structure with soot surrounded by nitrates and sulfates.This mixing state analysis method for individual PM_(2.5)particles provides information regarding chemical composition and haze formation mechanisms,and has the potential to facilitate the formulation of haze prevention and control policies. | Hui Chen Fengkui Duan Jingjing Du Ranhao Yin Lidan Zhu Jinlu Dong Kebin He Zhenli Sun Suhua Wang | 2021 | Journal of Environmental Sciences2021，33，6： | 2 |
| 7 | Using Si depletion in aerosol to identify the sources of crustal dust in two Chinese megacities显示文摘 | Qing Zhao Kebin He Kenneth A. Rahn Yongliang Ma Fumo Yang Fengkui Duan | 2010 | Atmospheric Environment2010，，21： | 1 |
| 8 | Improved measurement of carbonaceous aerosol:evaluation of the sampling artifacts and inter-comparison of the thermal-optical analysis methods显示文摘 | CHENG Yuan HE Kebin DUAN Fengkui | 2010 | Atmospheric Chemistry and Physics2010，10，17： | 1 |
| 9 | Identification and estimate of biomass burning contribution to the urban aerosol organic carbon concentrations in Beijing显示文摘 | Duan Fengkui Liu Xiande Yu Tong | 2004 | Atmospheric Environment2004，38，9： | 1 |
| 10 | Sampling artifacts of organic and inorganic aerosol:Implications for the speciation measurement of particulate matter显示文摘 | CHENG Yuan DUAN Fengkui HE Kebin | 2012 | Atmospheric Environment2012，55，8： | 1 |
| 11 | Identification and estimate of biomass burning contribution to the urban aerosol organic carbon concentration in Beijing显示文摘 | DUAN Fengkui LIU Xiande YU Tong | 2004 | Atmos Environ2004，38，： | 1 |
| 12 | Measurement of humic-like substances in aerosols : a review 显示文摘 | ZHENG Guangjie HE Kebin DUAN Fengkui | 2013 | EnvironmentalPollution2013，181，6： | 1 |
| 13 | A yearlong study of water-soluble organic carbon in Beijing II: Light absorption properties显示文摘 | Zhenyu Du Kebin He Yuan Cheng Fengkui Duan Yongliang Ma Jiumeng Liu Xiaolu Zhang Mei Zheng Rodney Weber | 2014 | Atmospheric Environment2014，，： | 1 |
| 14 | Measurement of semivolatile carbonaceous aerosols and its implications:a review显示文摘 | CHENG Yuan HE Kebin DUAN Fengkui | 2009 | Environment International2009，35，3： | 1 |
| 15 | Positive sampling artifact of carbonaceous aerosols and its influence on the thermal-optical split of OC/EC显示文摘 | CHENG Yuan HE Kebin DUAN Fengkui | 2009 | Atmospheric Chemistry and Physics2009，9，18： | 1 |
| 16 | A yearlong study of water-soluble organic carbon in Beijing II: Light absorption properties显示文摘 | Zhenyu Du Kebin He Yuan Cheng Fengkui Duan Yongliang Ma Jiumeng Liu Xiaolu Zhang Mei Zheng Rodney Weber | 2014 | Atmospheric Environment2014，，： | 1 |
| 17 | Identification andestimate of biomass burning contribution to the urban aerosolorganic carbon concentrations in Beijing显示文摘 | DUAN Fengkui LIU Xiande YU Tong | 2004 | Atmospheric Envi-ronment2004，38，9： | 1 |
| 18 | Characteristics of carbonaceous aerosols in Beijing, China 显示文摘 | DUAN Fengkui HE Kebin MA Yongliang | 2005 | Chemosphere2005，60，： | 1 |
| 19 | Identification and estimate of biomass burning contribution to the urban aerosol organic carbon concentrations in Beijing显示文摘 | Fengkui Duan Xiande Liu Tong Yu Hélène Cachier | 2003 | Atmospheric Environment2003，，9： | 1 |
| 20 | Characteristics of carbonaceous aerosols in Beijing, China显示文摘 | Fengkui Duan Kebin He Yongliang Ma Yingtao Jia Fumo Yang Yu Lei S. Tanaka T. Okuta | 2005 | Chemosphere2005，，3： | 1 |
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