Celine S L Lee

The Hong Kong Polytechnic University, Hong Kong, Hong Kong

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Publications (7)14.12 Total impact

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    ABSTRACT: Carbonaceous aerosols were studied at three background sites in south and southwest China. Hok Tsui in Hong Kong had the highest concentrations of carbonaceous aerosols (OC=8.7±4.5μg/m(3), EC=2.5±1.9μg/m(3)) among the three sites, and Jianfeng Mountains in Hainan Island (OC=5.8±2.6μg/m(3), EC=0.8±0.4μg/m(3)) and Tengchong mountain over the east edge of the Tibetan Plateau (OC=4.8±4.0μg/m(3), EC=0.5±0.4μg/m(3)) showed similar concentration levels. Distinct seasonal patterns with higher concentrations during the winter, and lower concentrations during the summertime were observed, which may be caused by the changes of the regional emissions, and monsoon effects. The industrial and vehicular emissions in East, Southeast and South China, and the regional open biomass burning in the Indo-Myanmar region of Asia were probably the two major potential sources for carbonaceous matters in this region.
    Environmental Pollution 11/2010; 158(11):3392-400. · 3.73 Impact Factor
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    ABSTRACT: The historical application/usage and management of chemicals in Hong Kong have been distinctively different from mainland China. In the present study, polybrominated diphenyl ethers (PBDEs) were measured in year-round atmospheric particle samples collected from urban Hong Kong and Guangzhou for comparison. The concentrations of BDE-209 and Sigma9PBDEs (defined as the sum of BDE-28, -47, -66, -100, -99, -154, -153, -138 and -183) in Guangzhou ranged from 758 to 21,900 pg m(-3) and from 31.8 to 3320 pg m(-3), respectively, and in Hong Kong ranged from 8.5 to 895 pg m(-3) and from 1.0 to 386 pg m(-3), respectively. Elevated concentrations of PBDEs were observed in Guangzhou, showing significant atmospheric PBDE pollution. BDE-209, -47, and -99 were the dominant congeners in all the samples, suggesting that the widely used commercial penta- and deca-BDE products were the original sources. Distinct seasonal patterns were observed in the PBDE concentrations of aerosols in Hong Kong, higher during the winter monsoon period, and lower during summertime. The less distinct seasonal variations of PBDE concentrations in the aerosols of Guangzhou suggested the dominance of local pollution sources around the city. Significant correlations were found between BDE-209 and organic carbon (OC) or elemental carbon (EC) in the two cities, suggesting that combustion may be an important pathway introducing BDE-209 to the atmosphere. The lower BDE-209 concentrations along with higher OC/EC ratios implied that a quick loss of BDE-209 may occur during the aerosol aging processes. Back trajectory analysis showed that the high PBDE concentrations observed in Hong Kong may be related to the outflows from the inland area of the Pearl River Delta (PRD) by prevailing the northeast or northwest wind in winter.
    Journal of Environmental Monitoring 07/2009; 11(6):1185-91. · 2.09 Impact Factor
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    ABSTRACT: The Pearl River Delta (PRD) is one of the largest fast-developing economic zones in China. Hong Kong and the mainland part of the PRD differed in socio-economic development history and chemical management policies. Polyurethane foam (PUF)-passive air sampling (PAS) was deployed at 21 regional air quality monitoring stations across the PRD in summer and winter, respectively. Dichloro-diphenyl-trichloroethane (DDT), chlordane and hexachlorobenzene (HCB) were analyzed with GC-MS. High total DDT (240-3700 pg m(-3)) and chlordane (100-2600 pg m(-3)) concentrations were observed. Concentrations of DDTs and chlordane were higher in summer than winter; HCB vice versa. Spatially, the mainland part of the PRD generally displayed higher DDT concentrations than Hong Kong. Antifouling paint for fishing ships in coastal China was suggested to be an important current DDT source in the coast. The reason is unknown for the very low trans-/cis-chlordane (TC/CC) ratios (0.27) found in the mainland in winter. HCB concentrations were relatively uniform across the PRD, and long range transport of HCB from inland/North China to the PRD in winter was suggested.
    Journal of Environmental Monitoring 07/2007; 9(6):582-8. · 2.09 Impact Factor
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    ABSTRACT: Organochlorine pesticides (OCPs) were measured in the atmosphere over the period of December 2003–December 2004 at four sampling sites in Guangzhou and Hong Kong. Gas phase and particle phase concentrations of 8 OCP species, including trans-chlordane (t-CHL), cis-chlordane (c-CHL), p,p 0 -DDT, p,p 0 -DDE, o,p 0 -DDT, a-endosulfan, a-and g-hexachlorocyclohexane (HCH), were studied. OCPs were found predominantly in the gas phase in all seasons. t-CHL, c-CHL, o,p 0 -DDT, p,p 0 -DDT and a-endosulfan had significantly (po0.001) higher concentrations than other OCPs, with mean values (gas+particle) typically ranging from 103 to 1440 pg m À3 . In general, the concentrations of OCPs in summer were higher than that in winter, except for a-HCH which showed no clear seasonal pattern. Higher levels of g-HCH and o,p 0 -DDT found in Guangzhou could be attributed to the present usage of lindane and dicofol in the Pearl River Delta (PRD) region. The very high concentrations of p,p 0 -DDT and a-endosulfan were observed at all sampling sites. The results of 7 days air back trajectory analysis indicated that the unusual high p,p 0 -DDT levels in summer in both cities could be related to the seasonal usage of DDT containing antifouling paints for fishing ships in the upwind seaports of the region. The high concentrations of a-endosulfan in winter in the study area suggested an atmospheric transport by the winter monsoon from the East China, where endosulfan is being used as insecticide in cotton fields. The consistency of the seasonal variation of concentrations and isomeric ratios of DDTs and a-endosulfan with the alternation of winter monsoon and summer monsoon suggested that the Asian monsoon plays an important role in the long-range atmospheric transport of OCPs.
    Atmospheric Environment 01/2007; 41:3889-3903. · 3.11 Impact Factor
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    ABSTRACT: Rapid urbanization and industrialization in South China has placed great strain on the environment and on human health. In the present study, the total suspended particulate matter (TSP) in the urban and suburban areas of Hong Kong and Guangzhou, the two largest urban centres in South China, was sampled from December 2003 to January 2005. The samples were analysed for the concentrations of major elements (Al, Fe, Mg and Mn) and trace metals (Cd, Cr, Cu, Pb, V and Zn), and for Pb isotopic composition. Elevated concentrations of metals, especially Cd, Pb, V and Zn, were observed in the urban and suburban areas of Guangzhou, showing significant atmospheric trace element pollution. Distinct seasonal patterns were observed in the heavy metal concentrations of aerosols in Hong Kong, with higher metal concentrations during the winter monsoon period, and lower concentrations during summertime. The seasonal variations in the metal concentrations of the aerosols in Guangzhou were less distinct, suggesting the dominance of local sources of pollution around the city. The Pb isotopic composition in the aerosols of Hong Kong had higher 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios in winter, showing the influence of Pb from the northern inland areas of China and the Pearl River Delta (PRD) region, and lower 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios in summer, indicating the influence of Pb from the South Asian region and from marine sources. The back trajectory analysis showed that the enrichment of heavy metals in Hong Kong and Guangzhou was closely associated with the air mass from the north and northeast that originated from northern China, reflecting the long-range transport of heavy metal contaminants from the northern inland areas of China to the South China coast.
    Atmospheric Environment 01/2007; 41:432-447. · 3.11 Impact Factor
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    ABSTRACT: Rapid urbanization and industrialization in South China has placed great strain on the environment and on human health. In the present study, the total suspended particulate matter (TSP) in the urban and suburban areas of Hong Kong and Guangzhou, the two largest urban centres in South China, was sampled from December 2003 to January 2005. The samples were analysed for the concentrations of major elements (Al, Fe, Mg and Mn) and trace metals (Cd, Cr, Cu, Pb, V and Zn), and for Pb isotopic composition. Elevated concentrations of metals, especially Cd, Pb, V and Zn, were observed in the urban and suburban areas of Guangzhou, showing significant atmospheric trace element pollution. Distinct seasonal patterns were observed in the heavy metal concentrations of aerosols in Hong Kong, with higher metal concentrations during the winter monsoon period, and lower concentrations during summertime. The seasonal variations in the metal concentrations of the aerosols in Guangzhou were less distinct, suggesting the dominance of local sources of pollution around the city. The Pb isotopic composition in the aerosols of Hong Kong had higher 206Pb/207Pb and 208Pb/207Pb ratios in winter, showing the influence of Pb from the northern inland areas of China and the Pearl River Delta (PRD) region, and lower 206Pb/207Pb and 208Pb/207Pb ratios in summer, indicating the influence of Pb from the South Asian region and from marine sources. The back trajectory analysis showed that the enrichment of heavy metals in Hong Kong and Guangzhou was closely associated with the air mass from the north and northeast that originated from northern China, reflecting the long-range transport of heavy metal contaminants from the northern inland areas of China to the South China coast.
    Atmospheric Environment. 01/2007;
  • Celine S. L. Lee, Shihua Qi, Gan Zhang, Xiangdong Li
    Chinese Journal of Geochemistry 02/2006; 25:20-20.