Landesbetrieb Hessisches Landeslabor, Am Versuchsfeld 11-13, 34128 Kassel, Germany.
Environ Int. 2015 Jul;80:72-8. doi: 10.1016/j.envint.2015.03.005. Epub 2015 Apr 19.
During a regional monitoring project of organic-farmed, free-range and cage-free eggs, high levels of dioxin-like compounds were detected in organic-farmed eggs, using the dioxin responsive chemical-activated luciferase gene expression (DR-CALUX®) bioassay. Further evaluations performed with GC-HRMS (gas chromatography in combination with high resolution mass spectrometry) revealed elevated amounts of non-dioxin-like (non-dl) polychlorinated biphenyls (PCBs) dominated by most lipophilic congeners like PCB 138, 153 and 180 and of dioxin-like (dl) PCBs, with a congener pattern in the descending order of PCB 118, 156, 167, 105, 189, 157, 105, 126 and PCB 77. Contaminations with polychlorinated dibenzo-p-dioxins (PCDDs) appeared of minor priority, with only hepta- and octa-substituted dioxins above their limits of quantification (LOQs). The pattern of polychlorinated dibenzofurans (PCDFs) was dominated by low amounts of tetra- and penta-chlorinated congeners. To identify the source of contamination, several samples of organic-farmed eggs, soil, laying hens, feedstuff, corrugated asbestos-cement cover plates (ACPs), stable dust and debris collected in the gutter of the stable, were analyzed. Comparing PCB congener-pattern of individual samples, the source was traced back to the coating of ACPs, which covered roof and sidewalls of the stable. Because coating materials probably have been used for roofing and cladding in many countries worldwide, there is a high probability that the presented case report is not a local incident but rather describes a new source of PCB contamination, yet widely unknown or underestimated.
在一项针对有机养殖、自由放养和笼养鸡蛋的区域监测项目中，使用二恶英反应化学激活荧光素酶基因表达（DR-CALUX®）生物测定法，在有机养殖鸡蛋中检测到高水平的二恶英类化合物。使用气相色谱-高分辨质谱（GC-HRMS）进行的进一步评估显示，非二恶英类（非 dl）多氯联苯（PCBs）的含量升高，以最亲脂的同系物为主，如 PCB 138、153 和 180，以及二恶英类（dl）PCBs，同系物模式按 PCB 118、156、167、105、189、157、105、126 和 PCB 77 的降序排列。多氯二苯并对二恶英（PCDDs）的污染似乎处于次要优先级，只有七氯和八氯取代的二恶英超过其定量限（LOQs）。多氯二苯并呋喃（PCDFs）的模式主要由低浓度的四氯和五氯同系物组成。为了确定污染的来源，对有机养殖鸡蛋、土壤、产蛋母鸡、饲料、波纹石棉水泥覆盖板（ACPs）、厩舍灰尘和杂物进行了分析。通过比较个别样本的 PCB 同系物模式，追溯到 ACPs 的涂层是污染的来源，这些 ACPs 覆盖了厩舍的屋顶和侧壁。由于涂层材料可能已在世界上许多国家用于屋顶和覆层，因此很有可能所呈现的案例报告不是一个地方性事件，而是描述了一种新的 PCB 污染来源，而这种来源尚未被广泛知晓或低估。
