Department of Environmental Engineering, Middle East Technical University, 06531, Ankara, Turkey.
Environ Sci Pollut Res Int. 2011 Jul;18(6):968-77. doi: 10.1007/s11356-010-0430-z. Epub 2011 Feb 2.
The most significant application of polychlorinated biphenyls (PCBs) is in transformers and capacitors. Therefore, power plants are important suspected sources for entry of PCBs into the environment. In this context, the levels and distribution of PCBs in sediment, soil, ash, and sludge samples were investigated around Seyitömer thermal power plant, Kütahya, Turkey. Moreover, identity and contribution of PCB mixtures were predicted using the chemical mass balance (CMB) receptor model.
United States Environmental Protection Agency methods were applied during sample preparation, extraction (3540C), cleanup (3660B, 3665A, 3630C), and analysis (8082A).
ΣPCB concentrations in the region ranged from not detected to 385 ng/g dry weight, with relatively higher contamination in sediments in comparison to soil, sludge, and ash samples collected from around the power plant. Congener profiles of the sediment and soil samples show penta-, hexa-, and hepta-chlorobiphenyls as the major homolog groups. The results from the CMB model indicate that PCB contamination is largely due to Clophen A60/A40 and Aroclor 1254/1254(late)/1260 release into the sediment and sludge samples around the thermal power plant.
Since there are no other sources of PCBs in the region and the identity of PCB sources estimated by the CMB model mirrors PCB mixtures contained in transformers formerly used in the plant, the environmental contamination observed especially in sediments is attributed to the power plant. Release of PCBs over time, as indicated by the significant concentrations observed even in surface samples, emphasizes the importance of the need for better environmental management.
多氯联苯（PCBs）最重要的应用是在变压器和电容器中。因此，发电站是 PCB 进入环境的重要疑似来源。在这种情况下，研究了土耳其库塔亚塞伊托梅尔火力发电厂周围的沉积物、土壤、灰分和污泥样品中 PCB 的水平和分布。此外，还使用化学质量平衡（CMB）受体模型预测了 PCB 混合物的成分和贡献。
在样品制备、提取（3540°C）、净化（3660B、3665A、3630C）和分析（8082A）过程中采用了美国环保署方法。
该地区的ΣPCB 浓度范围从未检出到 385ng/g 干重，与从发电厂周围采集的土壤、污泥和灰分样品相比，沉积物的污染程度相对较高。沉积物和土壤样品的同系物分布显示五氯、六氯和七氯联苯是主要的同系物组。CMB 模型的结果表明，PCB 污染主要是由于 Clophen A60/A40 和 Aroclor 1254/1254（后期）/1260 释放到火力发电厂周围的沉积物和污泥样品中。
由于该地区没有其他 PCB 来源，并且 CMB 模型估计的 PCB 来源与工厂中使用的变压器中所含的 PCB 混合物一致，因此特别是在沉积物中观察到的环境污染归因于该发电厂。随着时间的推移释放的 PCB，如即使在表面样品中也观察到的显著浓度所表明的那样，强调了更好的环境管理的必要性。
