- 期刊
- OpenAccess
Particle Size Distributions of PCDD/Fs and PBDD/Fs in Ambient Air in a Suburban Area in Beijing, China
並列摘要
The particle size distributions of polychlorinated and polybrominated dibenzo-＂p＂-dioxins and dibenzofurans (PCDD/Fs and PBDD/Fs, respectively; together labeled PXDD/Fs) in ambient air in a suburban area in Beijing, China, were determined. The sums of the concentrations of the 17 2,3,7,8-PCDD/Fs and the sums of the concentrations of the 13 2,3,7,8-PBDD/Fs that were analyzed were 1499-2799 fg m^(-3) (95.4-175.4 fg I-TEQ m^(-3)) and 1171-2424 fg m^(-3) (42.2-109.3 fg TEQ m-3), respectively. The PXDD/Fs were mainly (~90%) in the particulate phase. Significant linear correlations were found between the gas/particle partition coefficients (K_p) and subcooled liquid vapor pressures (P_L^0) of the PXDD/Fs. The regression coefficients indicated that the PCDD/Fs were mainly adsorbed to the particles and that the PBDD/Fs were mainly absorbed by the particles. The concentrations of the PXDD/Fs increased as the particle size decreased. The highest PXDD/F concentrations were found in the ＂d_(ae)＂＜1.0 μm particles and more than 80% of the PXDD/Fs were found to be in the ＂d_(ae)＂＜2.5 μm particles. Similar regression coefficients were found for the K_P against P_L^0 for the different particle size fractions in the air. The PXDD/F distribution profiles in particles of different sizes were also studied. The lower chlorinated PCDD/Fs were found at higher concentrations in the coarser particles, and the higher chlorinated PCDD/Fs were mainly found in the finer particles. Polybrominated dibenzofurans, particularly the higher brominated dibenzofurans, were the dominant PBDD/F congeners. The contributions of the higher brominated dibenzofurans to the total PBDD/F concentrations decreased as the particle size increased, but that was not the case for the polybrominated dibenzo-＂p＂-dioxins.
延伸閱讀
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