“永固紫”染料和四氯苯醌中多氯代二苯并二噁/呋喃的分析

Polychlorinated Dibenzo-p-Dioxins and Polychlorinated Dibenzofurans in C. I. Violet 23 Dyes and Chloranils

采用浓硫酸对5种不同来源的四氯苯醌和“永固紫”染料样品进行溶解分散,用甲苯提取和多层色谱柱纯化,利用同位素稀释法及高分辨气相色谱质谱(HRGCHRMS)联用技术,测定了其中的多氯代二苯并二口恶口英呋喃(PCDDF)的质量比。结果表明“永固紫”染料及其原料中PCDDF的质量比异常高,八氯代二苯并二口恶口英呋喃(OCDDF)已达到μgg级甚至100μgg级,七氯代二苯并二口恶口英呋喃(HpCDDF)和六氯代二苯并二口恶口英呋喃(HxCDDF)质量比也达到ngg级。所有样品的毒性当量浓度(TEQ)均已超过10pgg的危险水平,是纺织品中PCDDF的一类重要污染源。并进一步探讨了PCDDF的来源。

A simple method for the extraction and analysis of polychlorinated dibenzo p dioxins and polychlorinated dibenzofurans (PCDD/F) in dyes and chloranils has been developed. Five chloranil samples and a dye sample (C.I.Violet 23) were dissolved and dispersed in sulfuric acid, followed by extracting with toluene. After the clean up by alumina, silica and Florisil columns, the PCDD/F extracts were analysed by high resolution gas chromatograph/high resolution mass spectrometry (HRGC/HRMS). It was found that the dye and its raw material contained octachlorinated dibenzodioxin/furans (OCDD/F) at 1 to 100 μg/g level and hexa , hepta congeners ng/g levels. The toxic equivalencies (TEQ) of the samples were all beyond the dangerous level. They are found to be one of the important sources of dioxins in textile fabrics. Further investigations were performed to identify their real source.