Liu Xiaoyu, Guo Zhishi, Krebs Kenneth A, Greenwell Dale J, Roache Nancy F, Stinson Rayford A, Nardin Joshua A, Pope Robert H
U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Air Pollution Prevention and Control Division Research Triangle Park, NC 27711, United States.
U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Air Pollution Prevention and Control Division Research Triangle Park, NC 27711, United States.
Chemosphere. 2016 Apr;149:62-9. doi: 10.1016/j.chemosphere.2016.01.075. Epub 2016 Feb 3.
Dust is an important sink for indoor air pollutants, such as polychlorinated biphenyls (PCBs) that were used in building materials and products. In this study, two types of dust, house dust and Arizona Test Dust, were tested in a 30-m(3) stainless steel chamber with two types of panels. The PCB-containing panels were aluminum sheets coated with a PCB-spiked primer or caulk. The PCB-free panels were coated with the same materials but without PCBs. The dust evenly spread on each panel was collected at different times to determine its PCB content. The data from the PCB panels were used to evaluate the PCB migration from the source to the dust through direct contact, and the data from the PCB-free panels were used to evaluate the sorption of PCBs through the dust/air partition. Settled dust can adsorb PCBs from air. The sorption concentration was dependent on the congener concentration in the air and favored less volatile congeners. When the house dust was in direct contact with the PCB-containing panel, PCBs migrated into the dust at a much faster rate than the PCB transfer rate due to the dust/air partition. The dust/source partition was not significantly affected by the congener's volatility. For a given congener, the ratio between its concentration in the dust and in the source was used to estimate the dust/source partition coefficient. The estimated values ranged from 0.04 to 0.16. These values are indicative of the sink strength of the tested house dust being in the middle or lower-middle range.
灰尘是室内空气污染物的一个重要汇，比如建筑材料和产品中曾使用的多氯联苯（PCBs）。在本研究中，两种类型的灰尘，即室内灰尘和亚利桑那试验粉尘，在一个带有两种类型面板的30立方米不锈钢试验箱中进行了测试。含多氯联苯的面板是涂有多氯联苯加标底漆或填缝料的铝板。不含多氯联苯的面板涂有相同材料但不含多氯联苯。在不同时间收集均匀分布在每个面板上的灰尘，以测定其多氯联苯含量。来自含多氯联苯面板的数据用于评估多氯联苯从源头通过直接接触向灰尘的迁移，而来自不含多氯联苯面板的数据用于评估多氯联苯通过灰尘/空气分配作用的吸附情况。沉降灰尘能够从空气中吸附多氯联苯。吸附浓度取决于空气中同系物的浓度，且更有利于挥发性较低的同系物。当室内灰尘与含多氯联苯面板直接接触时，由于灰尘/空气分配作用，多氯联苯向灰尘中的迁移速度比多氯联苯的转移速度快得多。灰尘/源头分配不受同系物挥发性的显著影响。对于给定的同系物，其在灰尘和源头中的浓度之比用于估算灰尘/源头分配系数。估算值范围为0.04至0.16。这些值表明所测试的室内灰尘的汇强度处于中等或中低范围。
