Study of spatial-temporal variations, source apportionment and ozone formation potential of VOCs in Hong Kong

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Study of spatial-temporal variations, source apportionment and ozone formation potential of VOCs in Hong Kong

 

Author: Cui, Long
Title: Study of spatial-temporal variations, source apportionment and ozone formation potential of VOCs in Hong Kong
Degree: M.Sc.
Year: 2012
Subject: Volatile organic compounds -- Environmental aspects -- China -- Hong Kong.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: 81 leaves : ill. (chiefly col.), 1 map ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2551497
URI: http://theses.lib.polyu.edu.hk/handle/200/6849
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.

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