电炉铁合金飞灰中金属和二噁英分布特性研究

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.

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

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.