Journal of Pollution Effects & Control
Open Access
ISSN: 2375-4397
+44 1223 790975
ISSN: 2375-4397
+44 1223 790975
Shun-Cheng Lee
The Hong Kong Polytechnic University, China
Posters & Accepted Abstracts: Pollut Eff Cont
Hong Kong is a densely populated city with heavy traffic volume. A large number of volatile organic compounds (VOCs), which are the precursors of tropospheric ozone and secondary organic aerosols (SOAs), are emitted from traffic-related sources. Special attention has been paid on the characteristics of roadside VOCs and their impacts on the local air quality of Hong Kong during the past decades. In this study, proton transfer reaction-mass spectrometry (PTR-MS) is firstly applied to the simultaneous real-time monitoring of oxygenated volatile organic compound (OVOCs) and VOCs in Hong Kong. The performances of PTR-MS were examined under different relative humidity and temperature of inlet air with hydronium ion (H3O+) as the primary ion source. Strong correlation between calibrated reaction rate, inlet relative humidity and temperature was found which matched well by poly 2D regression. Inter-comparison was also performed between the measurement from PTR-MS, off-line DNPH cartridge samples and on-line GC-FID system. Our results suggested that PTR-MS can be applied on the long term measurements of roadside OVOCs and VOCs with good stability and reliability in Hong Kong. VOCs and OVOCs were strongly correlated with traffic conditions at the roadside site, which can be found by high-time resolution monitoring of OVOCs and VOCs by PTR-MS and demonstrated by the source apportionment of VOCs through PMF model. Vehicular emission is still one of the dominant sources of ambient OVOCs and VOCs in Hong Kong.
Email: shun-cheng.lee@polyu.edu.hk