Institute for Chemical and Bioengineering, Swiss Federal Institute of Technology, (ETH Zurich) , Vladimir-Prelog-Weg 1, CH-8093 Zurich, Switzerland.
Swiss Federal Laboratories for Material Science and Technology (EMPA), Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Environ Sci Technol. 2017 Mar 21;51(6):3269-3277. doi: 10.1021/acs.est.6b06051. Epub 2017 Mar 9.
Two small-scale field studies were conducted to investigate the transfer of substances from products into dust due to direct and air-mediated transfer. The project focused on semivolatile organic compounds (SVOCs), which are frequently found in and re-emitted from dust. For the field studies, four artificial products containing deuterium-labeled SVOCs (eight phthalates and adipates) were installed in residential indoor environments. Two plastic products were installed vertically to investigate substance transfer due to evaporation into air. One plastic product and a carpet were installed horizontally to investigate the direct transfer from source to dust. A pyrethroid was intentionally released by spraying a commercial spray. Dust samples were collected from the floor, elevated surfaces in the room and the surfaces of the horizontally installed products. We observed that the dust concentrations of substances exclusively transferred via air were similar at different collection sites, but the concentrations of chemicals present in horizontal products were up to 3 orders of magnitude higher in dust deposited on the source. We conclude that direct transfer from source into dust substantially increases the final SVOC concentration in dust in contact with the source, regardless of the vapor pressure of investigated SVOCs, and may lead to larger human exposure.
两项小规模现场研究旨在调查由于直接和空气介导转移而导致物质从产品转移到灰尘中的情况。该项目专注于半挥发性有机化合物（SVOCs），这些化合物经常在灰尘中被发现并重新释放出来。在现场研究中，将四种含有氘标记 SVOCs（八种邻苯二甲酸酯和己二酸酯）的人工产品安装在住宅室内环境中。两个塑料产品被垂直安装，以研究由于蒸发到空气中而导致的物质转移。一个塑料产品和一个地毯被水平安装，以研究从源到灰尘的直接转移。通过喷洒商业喷雾故意释放了一种拟除虫菊酯。从地板、房间内的高架表面和水平安装产品的表面收集灰尘样本。我们观察到，仅通过空气转移的物质的灰尘浓度在不同的收集点相似，但在与源接触的灰尘中，水平产品中存在的化学物质的浓度要高 3 个数量级。我们的结论是，无论所研究的 SVOCs 的蒸气压如何，源直接转移到灰尘中都会大大增加与源接触的灰尘中最终 SVOC 浓度，并可能导致更大的人体暴露。
