Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Civil and Structural Engineering | en_US |
dc.creator | Cui, Long | - |
dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/6849 | - |
dc.language | English | en_US |
dc.publisher | Hong Kong Polytechnic University | - |
dc.rights | All rights reserved | en_US |
dc.title | Study of spatial-temporal variations, source apportionment and ozone formation potential of VOCs in Hong Kong | en_US |
dcterms.abstract | VOCs are one of the major air pollutants, and non-methane hydrocarbons (NMHCs) play an important role to form photochemical ozone, besides, the heavy traffic in Hong Kong contributes a lot to VOCs. Therefore, it is important to study the spatial and temporal variations of VOCs in Hong Kong, together with its source apportionment and ozone formation potential. VOCs were detected at Mong Kok, Tung Chung and HKUST in this study. As expected, the highest levels of VOCs were found at roadsides, and the lowest levels appeared at rural area. For seasonal variations, all sampling sites had the same variation pattern, the lowest levels of VOCs appeared in summer and the highest levels of VOCs were observed in winter. The BTEX ratios of MK, TC, and UST were (1.3:6.8:1.0:1.5), (1.1:4.4:1.0:1.6), and (2.1:4.8:1.0:2.0), respectively. T/B ratios in MK, TC and UST were 6.4, 3.8 and 3.4, respectively. Using PCA model, source apportionment of each site was analyzed. Vehicle exhaust and solvent usage, diesel vehicular emissions, LPG usage, gasoline evaporation and biogenic emissions were the main five sources of VOCs at Mong Kok; Vehicle exhaust and solvent usage, diesel vehicular emissions, gasoline evaporation, biogenic emissions and coatings were the main five sources of VOCs at Tung Chung; Vehicle exhaust and solvent usage, LPG usage, biogenic emissions, industrial process and household solvent usage were the main five sources of VOCs at HKUST. The total ozone formation potentials at Mong Kok, Tung Chung and HKUST were 231.61μg·m⁻³, 119.15μg·m⁻³, 88.93 μg·m⁻³, respectively. As for Mong Kok, i-butane and n-butane appeared to be the top 6 VOCs for the most of the total ozone formation potential, caused by there were much more LPG usage at this site; as for Tung Chung and HKUST, isoprene and m/p-xylene appeared to be the top 6 VOCs for the most of the total ozone formation potential, since there were relatively lower traffic loading and biogenic emissions as well as solvent usage made up more percentage of VOCs sources at TC and UST. | en_US |
dcterms.extent | 81 leaves : ill. (chiefly col.), 1 map ; 30 cm. | en_US |
dcterms.isPartOf | PolyU Electronic Theses | en_US |
dcterms.issued | 2012 | en_US |
dcterms.educationalLevel | All Master | en_US |
dcterms.educationalLevel | M.Sc. | en_US |
dcterms.LCSH | Volatile organic compounds -- Environmental aspects -- China -- Hong Kong. | en_US |
dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
dcterms.accessRights | restricted access | en_US |
Files in This Item:
File | Description | Size | Format | |
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b25514970.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.97 MB | Adobe PDF | View/Open |
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