题名：PAH determination based on a rapid and novel gas purge-microsyringe extraction (GP-MSE) technique in road dust of Shanghai, China: Characterization, source apportionment, and health risk assessment
领域：Environmental Sciences & Ecology 二区
来源：SCIENCE OF THE TOTAL ENVIRONMENT
发表年代：2016年
作者：Zheng, Xin; Yang, Yi*; Liu, Min; Yu, Yingpeng; Zhou, John L.; Li, Donghao
A novel cleanup technique termed as gas purge-microsyringe extraction (GP-MSE) was evaluated and applied for polycyclic aromatic hydrocarbon (PAH) determination in road dust samples. A total of 68 road dust samples covering almost the entire Shanghai area were analyzed for 16 priority PAHs using gas chromatography-mass spectrometry. The results indicate that the total PAH concentrations over the investigated sites ranged from 1.04 mu g/g to 134.02 mu g/g dw with an average of 13.84 mu g/g. High-molecular-weight compounds (4-6 rings PAHs) were significantly dominant in the total mass of PAHs, and accounted for 77.85% to 93.62%. Diagnostic ratio analysis showed that the road dust PAHs were mainly from the mixture of petroleum and biomass/coal combustions. Principal component analysis in conjunction with multiple linear regression indicated that the two major origins of road dust PAHs were vehicular emissions and biomass/fossil fuel combustions, which contributed 66.7% and 18.8% to the total road dust PAH burden, respectively. The concentration of benzo[a] pyrene equivalent (BaPeq) varied from 0.16 mu g/g to 24.47 mu g/g. The six highly carcinogenic PAH species (benz(a) anthracene, benzo(a) pyrene, benzo(b) fluoranthene, benzo(k) fluoranthene, dibenz(a,h) anthracene, and indeno(1,2,3-cd) pyrene) accounted for 98.57% of the total BaPeq concentration. Thus, the toxicity of PAHs in road dust was highly associated with high-molecular-weight compounds.
