抄録
Polychlorinated dibenzo-p-dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) and dioxin-like PCBs in slag and char from automobile shredder residue (ASR) were analyzed to observe any changes in characteristics and distribution of their congeners by the pyrolysis and melting process. In char, solid product from ASR pyrolysis, lack of air caused a higher concentration of PCDFs than that of PCDDs, and a large quantity of dioxin-like PCBs existed in low chlorinated isomers. The concentration of PCDDs/PCDFs in char was 0.542 ng/g, and the toxicity equivalent concentration was 0.072 ng-TEQ/g, and those of dioxin-like PCBs were 0.869 ng/g and 1.579 pg-TEQ/g, respectively. The melted slag of char was fabricated by different cooling methods: water quenching, air cooling and slow cooling. Concentration distributions of PCDDs/PCDFs were 1.513, 1.376, 2.432 pg-TEQ/g, respectively, and those of dioxin-like PCBs were 0.004, 0.005 0.010 pg-TEQ/g, respectively.
