Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, TX, USA.
Department of Building Science, Tsinghua University, Beijing, China.
Chemosphere. 2020 Jul;250:126284. doi: 10.1016/j.chemosphere.2020.126284. Epub 2020 Feb 21.
Semi-volatile organic compounds (SVOCs), such as phthalates, organophosphates, and polybrominated diphenyl ethers, are emerging as an important class of pollutants that are of serious health concerns. Determining concentrations of these pollutants is of great importance for environmental and exposure studies. In this work, a needle trap device (NTD) method was developed to measure the concentration of SVOCs in air samples. Sorbents were packed in the NTD to capture SVOCs with the aid of a sampling pump. NTD operational parameters, such as desorption temperature, desorption time, and sampling flow rate, were optimized for the target SVOCs. The limit of detection for air sampling by the NTD method ranged between 5 pg and 1 ng, depending on the SVOC compound. The variations in terms of NTD repeatability and reproducibility were lower than 14% for all cases. In addition, the influence of other experimental parameters, such as sampling temperature and humidity, breakthrough volume, NTD storage time, as well as carryover effect were examined. Finally, NTDs were used to determine emissions of gas-phase SVOCs from various consumer products in an emission cell and to collect total airborne SVOC samples (gas and particle phases) in an office. The results of NTD method were in an agreement with data obtained by conventional active sampling methods using Tenax® sorbent tubes and polyurethane foam samplers, but with improvements of relative standard deviation, sensitivity, and sampling time. The results demonstrated that the NTD method is a simple, sensitive, effective, reusable, and inexpensive technique for sampling and analyzing SVOCs in the concentration range from 2 ng m to 100 μg m in air.
半挥发性有机化合物（SVOCs），如邻苯二甲酸酯、有机磷酸酯和多溴二苯醚，作为一类新兴的重要污染物，引起了人们对其健康影响的严重关注。这些污染物浓度的测定对于环境和暴露研究至关重要。在这项工作中，开发了一种针管捕集装置（NTD）方法来测量空气中 SVOCs 的浓度。在采样泵的帮助下，将吸附剂填充到 NTD 中以捕获 SVOCs。优化了 NTD 操作参数，如解吸温度、解吸时间和采样流速，以针对目标 SVOCs。NTD 方法空气中采样的检出限范围为 5 pg 至 1 ng，具体取决于 SVOC 化合物。在所有情况下，NTD 重复性和再现性的变化均低于 14%。此外，还研究了其他实验参数的影响，如采样温度和湿度、穿透体积、NTD 储存时间以及携带效应。最后，使用 NTD 来确定各种消费品在排放室中气相 SVOCs 的排放情况，并在办公室中收集总空气 SVOC 样品（气相和颗粒相）。NTD 方法的结果与使用 Tenax®吸附管和聚氨酯泡沫采样器的传统主动采样方法获得的数据一致，但相对标准偏差、灵敏度和采样时间有所改善。结果表明，NTD 方法是一种简单、灵敏、有效、可重复使用且经济实惠的技术，可用于空气中浓度范围为 2 ng m 至 100 μg m 的 SVOCs 的采样和分析。
