Hannah Tyler J, Megson David, Sandau Courtney D
Chemistry Matters, Calgary, AB, Canada.
Chemistry Matters, Calgary, AB, Canada; Manchester Metropolitan University, Ecology & Environment Research Centre, Department of Natural Science, Manchester, UK.
Sci Total Environ. 2022 Dec 15;852:158529. doi: 10.1016/j.scitotenv.2022.158529. Epub 2022 Sep 3.
There has been an increased awareness of paints and pigments as a source of by-product PCBs in the environment. The majority of existing work has focused only on reporting the presence of the main PCBs in different products with a specific focus on the most PCB congeners, PCB11 and PCB209. This gives the impression that only a handful of PCBs are found in paints. However, this is not the case. PCB profiles in paints and pigments can be just as complex as commercial technical mixtures. This review identified the presence of 149 different PCBs in paint samples. For reference, only 141 different PCBs have been reported in all of the 5 main commercial Aroclor formulations (A1016, A1242, A1248, A1254 (early & late) and A1260). The total PCB concentrations in some paint samples can be substantial, with concentrations as high as 919 mg kg reported in azo pigments. When trying to identify sources of PCBs in the environment, pigments, dyes and paints are often overlooked. In this manuscript, we have compiled congener profiles from 140 different samples from the available scientific literature and presented this in the supplementary information as valuable resource for others to use in source identification applications. We have also proposed detailed mechanisms for the formation of PCBs in pigments, dyes and paints. In many cases, the PCB congeners predicted by these mechanisms provide an excellent match for what has been observed in the scientific literature. We have also identified several additional classes of pigments that are expected to contain PCBs but have yet to be verified by experimental data.
人们越来越意识到涂料和颜料是环境中多氯联苯副产品的一个来源。现有的大部分工作仅集中于报告不同产品中主要多氯联苯的存在情况,特别关注的是大多数多氯联苯同系物,即多氯联苯11和多氯联苯209。这给人一种印象,即涂料中只发现了少数几种多氯联苯。然而,事实并非如此。涂料和颜料中的多氯联苯谱可能与商业技术混合物一样复杂。本综述在涂料样品中鉴定出149种不同的多氯联苯。作为参考,在所有5种主要的商业氯丹配方(A1016、A1242、A1248、A1254(早期和晚期)以及A1260)中,仅报告了141种不同的多氯联苯。一些涂料样品中的多氯联苯总浓度可能相当高,偶氮颜料中的浓度高达919毫克/千克。在试图确定环境中多氯联苯的来源时,颜料、染料和涂料常常被忽视。在本手稿中,我们从现有科学文献中收集了140个不同样品的同系物谱,并在补充信息中呈现,作为其他人用于来源识别应用的宝贵资源。我们还提出了颜料、染料和涂料中多氯联苯形成的详细机制。在许多情况下,这些机制预测的多氯联苯同系物与科学文献中观察到的情况非常匹配。我们还确定了几类预计含有多氯联苯但尚未得到实验数据验证的其他颜料。