“永固紫”染料和四氯苯醌中多氯代二苯并二/呋喃的分析

 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 (HRGC/HRMS)联用技术，测定 了其中的多氯代二苯并二/呋喃(PCDD/F)的质量比。结果表明“永固紫”染料及其原料中P CDD/F的质量比异常高，八氯代二苯并二/呋喃(OCDD/F)已达到μg/g级甚至100 μg/g级，七氯代二苯并二/呋喃(HpCDD/F)和六氯代二苯并二/呋喃(HxCDD/F)质量比也达到 ng/g级。所有样 品的毒性当量浓度(TEQ)均已超过10 pg/g的危险水平，是纺织品中PCDD/F的一类重要污染源 。并进一步探讨了PCDD/F的来源。

Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in C. I. violet 23 dyes and chloranils]

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 micrograms/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.