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Measurement of PCB emissions from building surfaces using a novel portable emission test cell

机译：使用新型便携式排放测试单元测量建筑表面的PCB排放

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Polychlorinated biphenyls (PCBs) were used in building materials like caulks and paints from 1930-1970s and in some cases that caused elevated PCB concentrations in the indoor air at levels considered harmful to occupant health. PCBs are semivolatile organic compounds and capable of spreading from the original source to adjacent materials, indoor air and via adsorption from the air to indoor surfaces, causing secondary contaminations. Remediation of buildings with unsatisfactory indoor air concentrations is a complex and difficult task due to the secondary contamination of building materials and there is a need to prioritise remediation measures on different materials. An inexpensive and portable emission test cell was developed to resemble indoor conditions in relation to the area specific ventilation rate. Emissions were measured using the test cell in the laboratory on freshly made PCB paint. Further, the chamber was used for determining emissions from PCB-containing building materials in the field as well as remediated walls. The measurements showed that sorption of PCBs to chamber walls was insignificant after 2-4 days of exposure to the source. Over a period of two weeks emission rates did not change from any of the tested surfaces, however in the laboratory experiment emission rates decreased over a longer period (48 days) and was most pronounced for the lower chlorinated PCBs. (C) 2016 Elsevier Ltd. All rights reserved.
机译：1930年至1970年代，多氯联苯（PCB）被用于填缝材料和油漆等建筑材料，在某些情况下，导致室内空气中PCB的浓度升高，认为对人体健康有害。多氯联苯是半挥发性有机化合物，能够从原始来源扩散到室内空气中的相邻材料，并通过空气中的吸附而扩散到室内表面，从而引起二次污染。由于建筑材料的二次污染，对室内空气浓度不令人满意的建筑物进行修复是一项复杂而艰巨的任务，因此需要优先考虑对不同材料进行补救的措施。开发了一种廉价且便携式的排放测试单元，以在特定区域的通风速率方面类似于室内条件。在实验室中使用测试池对新鲜制作的PCB涂料测量排放。此外，该腔室用于确定野外含PCB的建筑材料以及修复墙体的排放。测量表明，暴露于源中2-4天后，PCB对腔室壁的吸附微不足道。在两周的时间内，任何测试表面的排放率都没有变化，但是在实验室实验中，排放率在较长的时间内（48天）下降，并且对于较低氯化的PCB最为明显。 （C）2016 Elsevier Ltd.保留所有权利。

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