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| Profiles of selected metals and dioxins in fly ash from ferroalloy electric melting furnaces |
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Abstract Concentrations of tetra-, penta-, hexa-, hepta-, and octachlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), as well as 12metal elements, in four fly ash samples from different metallurgical plants, were determined by a high resolution gas chromatography-low resolution mass spectrometer (HRGC-LRMS) and an atomic absorption spectrophotometer (AAS), respectively. The metal concentrations were very high in these samples. In general, Zn and Ni had the highest (1983.918~36729.200mg/kg) and the lowest (9.000~43.627mg/kg) concentrations, respectively, among the 12metal elements. The total PCDD/Fs concentrations (33.792~88.125ng/g) in the four samples were comparable to those in municipal solid waste incineration fly ashes reported in literature. Octachlorinated dibenzo-p-dioxin and dibenzofurans (OCDD/Fs) were the predominant congener in all samples, while a big difference in the PCDD/F homologue profiles was seen among the samples. Higher dioxin content may associate with higher heavy metals content.
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Received: 20 August 2013
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