Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements
Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements
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DOI：
10.1080/02786826.2016.1174329
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发表时间：
2016-01-01
影响因子：
5.2
通讯作者：
Asbach, C.
中科院分区：
文献类型：
--
作者：
Fonseca, A. S.;Viana, M.;Asbach, C.
在职业暴露研究中，使用传统的扫描迁移率粒度仪（SMPS）提供了高质量的数据，但可能会传达运输和应用的限制。目前正在开发旨在克服这些限制的新工具。本研究的目的是比较新型便携式NanoScan SMPS TSI 3910与两台固定式SMPS仪器和一台超细凝结颗粒计数器（UCPC）在受控气氛中对不同颗粒类型和浓度的性能，结果表明，NanoScan倾向于高估UCPC的颗粒数浓度，特别是对团聚颗粒（ZnO、火花产生的碳烟和柴油机碳烟颗粒）的相对差异> 20%。当测量紧凑和球形颗粒（NaCl和DEHS颗粒）时，获得了内部参考值和测量的数量浓度之间的最佳协议。对于大多数测量的气溶胶，NanoScan的粒径（模态尺寸）结果与SMPS测量的结果相当< [+/- 20%]。本研究的结果表明，使用单极和双极充电的移动性粒度仪可能受到粒径、形态、颗粒组成和浓度的不同影响。虽然NanoScan SMPS的尺寸精度大多在+/-25%以内，但它可能会错误计数总颗粒数浓度超过50%（特别是团聚颗粒），因此不适合需要高精度的职业暴露评估（例如，在第3层）。但是，它可以作为一种有用的工具，用于估计室内和工作场所空气中的气溶胶粒径分布，例如，在第二层。
During occupational exposure studies, the use of conventional scanning mobility particle sizers (SMPS) provides high quality data but may convey transport and application limitations. New instruments aiming to overcome these limitations are being currently developed. The purpose of the present study was to compare the performance of the novel portable NanoScan SMPS TSI 3910 with that of two stationary SMPS instruments and one ultrafine condensation particle counter (UCPC) in a controlled atmosphere and for different particle types and concentrations.The results show that NanoScan tends to overestimate particle number concentrations with regard to the UCPC, particularly for agglomerated particles (ZnO, spark generated soot and diesel soot particles) with relative differences >20%. The best agreements between the internal reference values and measured number concentrations were obtained when measuring compact and spherical particles (NaCl and DEHS particles). With regard to particle diameter (modal size), results from NanoScan were comparable < [+/- 20%] to those measured by SMPSs for most of the aerosols measured.The findings of this study show that mobility particle sizers using unipolar and bipolar charging may be affected differently by particle size, morphologies, particle composition and concentration. While the sizing accuracy of the NanoScan SMPS was mostly within +/- 25%, it may miscount total particle number concentration by more than 50% (especially for agglomerated particles), thus making it unsuitable for occupational exposure assessments where high degree of accuracy is required (e.g., in tier 3). However, can be a useful instrument to obtain an estimate of the aerosol size distribution in indoor and workplace air, e.g., in tier 2.