Joint Mass Spectrometry Centre, Cooperation Group "Comprehensive Molecular Analytics", Helmholtz Zentrum München, Neuherberg, Germany.
Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany.
Ann Work Expo Health. 2018 Aug 13;62(7):899-903. doi: 10.1093/annweh/wxy045.
Denuders are gas-particle partitioning tools and can be used in combination with filters and adsorbers for phase-separated collection of hazardous semi-volatile organic compound (SVOC) aerosols. Here, we investigated the suitability of carbonaceous monolithic multi-channel denuders for this approach. Particle transmission efficiency through the denuders was investigated using particles of polystyrene latex (PSL) and droplets of n-hexadecane and diethylene glycol. The time-dependent vapour collection efficiency was analysed for n-hexadecane and diethylene glycol vapours and also compared to calculated predictions. Our measurements showed an averaged transmission efficiency of 97 ± 4.4% for PSL particles with diameters of 0.51, 0.99, 1.93, and 3.00 µm. Measurements with one denuder and 1.08, 1.98, and 2.97 µm particles consisting of n-hexadecane or diethylene glycol resulted in an averaged transmission efficiency of 99 ± 6.5%. Regarding the vapour collection efficiency at a flow rate of 5 l min-1, n-hexadecane vapour could be adsorbed to a similar extent (91 ± 1.4% for one denuder, 98 ± 0.3% for two denuders) as diethylene glycol vapour (93 ± 1.8% for one denuder, 97 ± 0.9% for two denuders). The comparison between experimental and theoretical vapour collection efficiencies revealed differences around 2.8% for n-hexadecane and around 12.3% for diethylene glycol. The results show that the tested denuders can be used as vapour collection tools for SVOCs, and can be integrated in currently used personal air samplers for separated vapour and particle collection.
集尘器是一种气-粒分配工具，可与过滤器和吸附剂结合使用，对危险半挥发性有机化合物（SVOC）气溶胶进行分相收集。在这里，我们研究了碳质整体多通道集尘器在这种方法中的适用性。使用聚苯乙烯乳胶（PSL）颗粒和正十六烷和二甘醇液滴研究了颗粒通过集尘器的传输效率。分析了正十六烷和二甘醇蒸气的时变蒸气收集效率，并与计算预测值进行了比较。我们的测量结果表明，直径为 0.51、0.99、1.93 和 3.00 µm 的 PSL 颗粒的平均传输效率为 97 ± 4.4%。用一个集尘器和直径为 1.08、1.98 和 2.97 µm 的由正十六烷或二甘醇组成的颗粒进行的测量结果表明，平均传输效率为 99 ± 6.5%。在 5 l min-1 的流速下，关于蒸气收集效率，正十六烷蒸气的吸附程度相似（一个集尘器为 91 ± 1.4%，两个集尘器为 98 ± 0.3%），二甘醇蒸气的吸附程度相似（一个集尘器为 93 ± 1.8%，两个集尘器为 97 ± 0.9%）。实验和理论蒸气收集效率之间的比较显示，正十六烷的差异约为 2.8%，二甘醇的差异约为 12.3%。结果表明，所测试的集尘器可用作 SVOC 的蒸气收集工具，并可集成到目前使用的个人空气采样器中，用于蒸气和颗粒的分离收集。
