广州市不同功能区大气二噁英含量和分布特征研究

应用气相色谱-高分辨率质谱仪(GC-HRMS)对广州市秋冬季6个区域环境空气样品中的17种2,3,7,8-氯代二英含量进行了检测.结果表明,广州市各观测区域大气中二英毒性当量浓度范围为0.151～2.230pg.m-3,均值为0.418pg.m-3.各观测区域空气中二英毒性当量浓度分布存在一定的差异,本研究的背景区、居民住宅区和商业区二英毒性当量浓度较低且水平相近,分别为(0.294±0.099)、(0.305±0.115)、(0.308±0.102)pg.m-3.交通枢纽区、郊区和工业区二英毒性当量浓度相对较高,分别为(0.342±0.049)、(0.423±0.113)和(0.838±0.704)pg·m-3.广州市不同功能区二英毒性当量浓度呈现背景区<住宅区<商业区<交通枢纽区<郊区<工业区的分布特点.与2004年相比,广州市城区二英毒性当量浓度有所下降,郊区毒性当量浓度有所上升.

The distribution characteristics of PCDD/Fs in the atmosphere at different areas of Guangzhou City

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.