电炉铁合金飞灰中金属和二噁英分布特性研究

Profiles of selected metals and dioxins in fly ash from ferroalloy electric melting furnaces

分别利用高分辨气相色谱-低分辨质谱（HRGC-LRMS）联用仪、原子吸收分光光度计对4个电炉铁合金飞灰中4-8氯取代PCDD/Fs和12种金属进行检测，结果表明，飞灰中金属元素浓度高，其中重金属以 Zn 浓度最高，为19835.918-36729.200mg/kg；Ni 浓度最低，为9.000-43.627mg/kg.4个灰样中PCDD/Fs的浓度差别较大，总量在33.792-88.125ng/g范围内，该浓度水平与生活垃圾焚烧飞灰相当.4个灰样中PCDD/Fs的分布特征不尽相同，但是均以OCDD/F的浓度最高.飞灰中较高的二噁英浓度水平与高浓度的Fe、Cu、Ca和Ni等金属存在一定的相关性.

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.