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气溶胶颗粒密度测量方法研究

, PP. 746-752

Keywords: 激光技术,颗粒密度,粒径测量,空气动力学粒径,迁移粒径,气溶胶飞行时间质谱仪

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Abstract:

探索研究了静电迁移分级器(DMA)联用气溶胶飞行时间质谱仪(ATOFMS)测量气溶胶颗粒密度的方法。由DMA选出单分散粒径的气溶胶颗粒,通入气溶胶飞行时间质谱仪测定其对应的空气动力学粒径。根据电迁移粒径和空气动力学粒径间的定量关系得到球形颗粒密度或者非球形颗粒的有效密度。首先对已知化学成分和密度的邻苯二甲酸二辛酯(DOP)气溶胶颗粒进行标定实验,然后运用该方法对非球形的硫酸铵、氯化钠、硝酸铵颗粒进行测量,有效密度分别为1.211g/cm3、1.333g/cm3、1.039g/cm3;球形的橄榄油颗粒密度为0.914g/cm3。

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