Distribution of polychlorinated dibenzo-p-dioxins and dibenzofurans in various sizes of airborne particles
作者： Yoichi Kurokawa , Matsueda Takahiko , Nakamura Matayoshi , Takada Satoshi , Fukamachi Kazumi
DOI: 10.1016/S0045-6535(98)00278-1
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摘要: We investigated the particle size distribution of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) in atmospheric samples collected at four sites. The largest amounts particle-bound PCDD/F were found on small particles with aerodynamic diameters (dae) less than 1.1 microns that accounted for over 50% total PCDD/F, contributing mostly to toxicity providing 47% TEQs (Toxicity Equivalents) loading. PCDF showed about twice concentration PCDD TEQs. accumulation mode (dae microns) from 3.5 8.6 pg/m3. Five eight percent was large dae > 7 microns. It observed homologue profiles different fraction chlorinated groups increased increasing size. reentrainment soil including did not significantly influence particles. Two plausible mechanisms, mass transfer gas phase surface contribution fly ash emitted incinerators are proposed explain homologues partitioning among fractions.
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