The distribution characteristics of PCDD/Fs in the atmosphere at different areas of Guangzhou City
广州市不同功能区大气二英含量和分布特征研究

In this research, seventeen kinds of atmospheric PCDD/Fs components sampled from six regions of Guangzhou City in autumn were determined using GC/HRMS. The results demonstrated that the toxic equivalent (TEQ) of PCDD/Fs were in the range of 0.151 to 2.230 pg·m-3 and an average value was 0.418 pg·m-3. Moreover, the levels of atmospheric PCDD/Fs components were associated with regional environment. The results verified that the lower and similar TEQ of PCDD/Fs were (0.294±0.099), (0.305±0.115) and (0.308±0.102) pg·m-3 in the background, residential area and commercial district, respectively. Meanwhile, the TEQ levels in transport hub area, suburban and industrial areas were higher with the values as (0.342±0.049), (0.423±0.113) and (0.838±0.704) pg·m-3, respectively. Furthermore, TEQ distribution trend in functional urban regions of Guangzhou City ranked as background < residential area < commercial district < transport hub area < suburban < industrial district. Additionally, compared with that of 2004, the average TEQ in 2011 decreased in urban area and increased in suburban area.