Calibration of a particle mass spectrometer using polydispersed aerosol particles
Calibration of a particle mass spectrometer using polydispersed aerosol particles
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DOI：
10.1080/02786826.2018.1532071
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发表时间：
2018-11
影响因子：
5.2
通讯作者：
Cuizhi Sun;N. Takegawa
中科院分区：
文献类型：
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作者：
Cuizhi Sun;N. Takegawa
摘要在线气溶胶化学成分分析仪的常规校准对于评价现场测量数据质量具有重要意义。微分迁移率分析仪（DMA）和凝聚粒子计数器（CPC）的组合是一种可靠的常规校准方法。然而，出现了一些后勤问题，包括放射性材料的使用、质量控制和部署成本。在这里，我们提出了一种新的，简单的校准方法的粒子质谱仪使用多分散气溶胶粒子结合光学粒度仪。我们使用激光诱导白炽质谱分析仪（LII-MS）来测试新方法。多分散的气溶胶粒子的选定的化合物（硫酸铵和硝酸钾）产生的气溶胶雾化器。LII部分用作光学粒度仪，用于测量多分散气溶胶颗粒的数量/体积尺寸分布。基于从体积尺寸分布的积分估计的多分散气溶胶颗粒的质量浓度进行MS部分的校准。每种化合物的颗粒尺寸的准确性是一个关键问题，并通过测量单分散硫酸铵和硝酸钾颗粒以及聚苯乙烯胶乳颗粒的光脉冲高度分布进行评估。与传统的DMA-CPC方法和它的潜在的不确定性所提出的方法的比较进行了讨论。版权所有© 2018美国气溶胶研究协会
Abstract Routine calibrations of online aerosol chemical composition analyzers are important for assessing data quality during field measurements. The combination of a differential mobility analyzer (DMA) and condensation particle counter (CPC) is a reliable, conventional method for calibrations. However, some logistical issues arise, including the use of radioactive material, quality control, and deployment costs. Herein, we propose a new, simple calibration method for a particle mass spectrometer using polydispersed aerosol particles combined with an optical particle sizer. We used a laser-induced incandescence–mass spectrometric analyzer (LII-MS) to test the new method. Polydispersed aerosol particles of selected chemical compounds (ammonium sulfate and potassium nitrate) were generated by an aerosol atomizer. The LII section was used as an optical particle sizer for measuring number/volume size distributions of polydispersed aerosol particles. The calibration of the MS section was performed based on the mass concentrations of polydispersed aerosol particles estimated from the integration of the volume size distributions. The accuracy of the particle sizing for each compound is a key issue and was evaluated by measuring optical pulse height distributions for monodispersed ammonium sulfate and potassium nitrate particles as well as polystyrene latex particles. A comparison of the proposed method with the conventional DMA-CPC method and its potential uncertainties are discussed. Copyright © 2018 American Association for Aerosol Research