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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 | Size distributions and sources of elements in particulate matter at curbside,urban and rural sites in Beijing显示文摘Size distributions of 29 elements in aerosols collected at urban,rural and curbside sites in Beijing were studied.High levels of Mn,Ni,As,Cd and Pb indicate the pollution of toxic heavy metals cannot be neglected in Beijing.Principal component analysis (PCA) indicates 4 sources of combustion emission,crust related sources,traffic related sources and volatile species from coal combustion.The elements can be roughly divided into 3 groups by size distribution and enrichment factors method (EFs).Group 1 elements are crust related and mainly found within coarse mode including Al,Mg,Ca,Sc,Ti,Fe,Sr,Zr and Ba;Group 2 elements are fossil fuel related and mostly concentrated in accumulation mode including S,As,Se,Ag,Cd,Tl and Pb;Group 3 elements are multi-source related and show multi-mode distribution including Be,Na,K,Cr,Mn,Co,Ni,Cu,Zn,Ga,Mo,Sn and Sb.The EFs of Be,S,Cr,Co,Ni,Cu,Ga,Se,Mo,Ag,Cd,Sb,Tl and Pb show higher values in winter than in summer indicating sources of coal combustion for heating in winter.The abundance of Cu and Sb in coarse mode is about 2-6 times higher at curbside site than at urban site indicating their traffic sources.Coal burning may be the major source of Pb in Beijing since the phase out of leaded gasoline,as the EFs of Pb are comparable at both urban and curbside sites,and about two times higher in winter than that in summer. | Jingchun Duan Jihua Tan Shulan Wang Jimin Hao Fahe Chai | 2012 | Journal of Environmental Sciences2012，24，1： | 67 |
| 3 | Ambient volatile organic compounds pollution in China显示文摘Owing to rapid economic and industrial development,China has been suffering from degraded air quality and visibility. Volatile organic compounds(VOCs)are important precursors to the formation of ground-level ozone and hence photochemical smog. Some VOCs adversely affect human health. Therefore,VOCs have recently elicited public concern and given new impetus to scientific interest. China is now implementing a series of polices to control VOCs pollution. The key to formulating policy is understanding the ambient VOCs pollution status. This paper mainly analyzes the species,levels,sources,and spatial distributions of VOCs in ambient air. The results show that the concentrations of ambient VOCs in China are much higher than those of developed countries such as the United States and Japan,especial benzene,which exceeds available standards. At the same time,the ozone formation potential(OFP)and secondary organic aerosol formation potential(SOAFP)of various VOCs are calculated. Aromatics and alkenes have much higher OFPs,while aromatics have higher SOAFP. The OFPs of ambient VOCs in the cities of Beijing,Guangzhou and Changchun are very high,and the SOAFP of ambient VOCs in the cities of Hangzhou,Guangzhou and Changchun are higher. | Xinmin Zhang Zhigang Xue Hong Li Li Yan Yuan Yang Yi Wang Jingchun Duan Lei Li Fahe Chai Miaomiao Cheng Weiqi Zhang | 2017 | Journal of Environmental Sciences2017，29，5： | 34 |
| 4 | Size distribution, characteristics and sources of heavy metals in haze episod in Beijing显示文摘Size segragated samples were collected during high polluted winter haze days in 2006 in Beijing, China. Twenty nine elements and 9 water soluble ions were determined. Heavy metals of Zn, Pb, Mn, Cu, As, Cr, Ni, V and Cd were deeply studied considering their toxic efect on human being. Among these heavy metals, the levels of Mn, As and Cd exceeded the reference values of National Ambient Air Quality Standard(GB3095-2012) and guidelines of World Health Organization. By estimation, high percentage of atmospheric heavy metals in PM2.5indicates it is an efective way to control atmospheric heavy metals by PM2.5controlling. Pb, Cd, and Zn show mostly in accumulation mode, V, Mn and Cu exist mostly in both coarse and accumulation modes, and Ni and Cr exist in all of the three modes. Considering the health efect, the breakthrough rates of atmospheric heavy metals into pulmonary alveoli are: Pb(62.1%) > As(58.1%) > Cd(57.9%) > Zn(57.7%) > Cu(55.8%) > Ni(53.5%) > Cr(52.2%) > Mn(49.2%) > V(43.5%). Positive matrix factorization method was applied for source apportionment of studied heavy metals combined with some marker elements and ions such as K, As, SO4 2 etc., and four factors(dust, vehicle, aged and transportation, unknown) are identified and the size distribution contribution of them to atmospheric heavy metals are discussed. | Jingchun Duan Jihua Tan Jiming Hao Fahe Chai | 2014 | Journal of Environmental Sciences2014，26，1： | 26 |
| 5 | Gas-to-particle conversion of atmospheric ammonia and sampling artifacts of ammonium in spring of Beijing显示文摘PM2.5 and gaseous pollutants(SO2,HNO2,HNO3,HCl,and NH3) were simultaneously collected by Partisol- Model 2300 Sequential Speciation Sampler with denuder-filter pack system in the spring of 2013 in Beijing.Water-soluble inorganic ions and gaseous pollutants were measured by Ion Chromatography.Results showed that the concentrations of NH3,NH+ 4and PM2.5 had similar diurnal variation trends and their concentrations were higher at night than in daytime.The results of gas-to-particle conversion revealed that [NH3]:[NH+4] ratio was usually higher than 1; however,it was less than 1 and the concentration of NH+4 increased significantly during the haze episode,indicating that NH3 played an important role in the formation of fine particle.Research on the sampling artifacts suggested that the volatilization loss of NH+4 was prevalent in the traditional single filter-based sampling.The excess loss of HNO3 and HCl resulted from ammonium-poor aerosols and semivolatile inorganic species had severe losses in the clean day,whereas the mass of NH+ 4was usually overestimated during the single filter-based sampling due to the positive artifacts.Correlation analysis was used to evaluate the influence of meteorological conditions on the volatilization loss of NH+4.It was found that the average relative humidity and temperature had great effects on the loss of NH+4.The loss of NH+4 was significantly under high temperature and low humidity,and tended to increase with the increasing of absorption of gaseous pollutants by denuder.The total mass of volatile loss of NH+4,NO- 3and Cl- could not be ignored and its maximum value was 12.17 μg m-3.Therefore it is important to compensate sampling artifacts for semivolatile inorganic species. | WEI LianFang DUAN JingChun TAN JiHua MA YongLiang HE KeBin WANG ShuXiao HUANG XiaoFeng ZHANG YuanXun | 2015 | Science China Earth Sciences2015，58，3： | 11 |
| 6 | Concentration, sources and ozone formation potential of volatile organic compounds (VOCs) during ozone episode in Beijing显示文摘 | Jingchun Duan Jihua Tan Liu Yang Shan Wu Jimin Hao | 2007 | Atmospheric Research2007，，1： | 3 |
| 7 | Concentration, sources and ozone formation potential of volatile organic compounds (VOCs) during ozone episode in Beijing显示文摘 | Jingchun Duan Jihua Tan Liu Yang Shan Wu Jimin Hao | 2007 | Atmospheric Research2007，，1： | 2 |
| 8 | Roadside, Urban, and Rural comparison of size distribution characteristics of PAHs and carbonaceous components of Beijing, China显示文摘 | Jingchun Duan Jihua Tan Shulan Wang Fahe Chai Kebin He Jimin Hao | 2013 | Journal of Atmospheric Chemistry2013，，4： | 2 |
| 9 | Sources and characteristics of carbonaceous aerosol in two largest cities in Pearl River Delta Region, China显示文摘 | Jingchun Duan Jihua Tan Dingxi Cheng Xinhui Bi Wenjing Deng Guoying Sheng Jiamo Fu M.H. Wong | 2006 | Atmospheric Environment2006，，14： | 2 |
| 10 | Seasonal variation on size distribution and concentration of PAHs in Guangzhou city, China 显示文摘 | Duan Jingchun Bi Xinhui Tan Jihua | 2007 | Chemosphere2007，67，3： | 1 |
| 11 | Roadside, Urban, and Rural comparison of size distribution characteristics of PAHs and carbonaceous components of Beijing, China显示文摘 | Jingchun Duan Jihua Tan Shulan Wang Fahe Chai Kebin He Jimin Hao | 2013 | Journal of Atmospheric Chemistry2013，，4： | 1 |
| 12 | Chemicalcharacteristics of haze during summer and winter in Guangzhou显示文摘 | TAN Jihua DUAN Jingchun CHEN Duohong | 2009 | Atmos Res2009，94，2： | 1 |
| 13 | Sources and characteristics of carbonaceous aerosol in two largest cities in Pearl River Delta Region, China显示文摘 | Jingchun Duan Jihua Tan Dingxi Cheng Xinhui Bi Wenjing Deng Guoying Sheng Jiamo Fu M.H. Wong | 2006 | Atmospheric Environment2006，，14： | 1 |
| 14 | Chemical characteristics of haze during summer and winter in Guangzhou显示文摘 | Tan Jihua Duan Jingchun Chen Duohong | 2009 | Atmospheric Research2009，94，2： | 1 |
| 15 | Concentra tion,sources and ozone formation potential of volatile organic compounds (VOCs) during ozone episode in Beiiing显示文摘 | DUAN Jingchun TAN Jihua LIU Yang | 2008 | Atmospheric Research2008，88，1： | 1 |
| 16 | Chemical characteristics of haze during summer and winter in Guangzhou 显示文摘 | Tan Jihua Duan Jingchun Chen Duohong | 2009 | Atmospheric Research2009，94，2： | 1 |
| 17 | Atmospheric heavy metals and Arsenic in China: Situation, sources and control policies显示文摘 | Jingchun Duan Jihua Tan | 2013 | Atmospheric Environment2013，，： | 1 |
| 18 | Concentration, sources and ozone formation potential of volatile organic compounds (VOCs) during ozone episode in Beijing显示文摘 | Jingchun Duan Jihua Tan Liu Yang Shan Wu Jimin Hao | 2007 | Atmospheric Research2007，，1： | 1 |
| 19 | Sources and characteristics of carbonaceous aerosol in two largest cities in Pearl River Delta Region, China显示文摘 | Jingchun Duan Jihua Tan Dingxi Cheng Xinhui Bi Wenjing Deng Guoying Sheng Jiamo Fu M.H. Wong | 2006 | Atmospheric Environment2006，，14： | 1 |
| 20 | Atmospheric heavy metals and Arsenic in China: Situation, sources and control policies 显示文摘 | Jingchun Duan Jihua Tan | 2013 | Atmospheric Environment2013，74，： | 1 |
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