High-accuracy effective density measurements of sodium methanesulfonate and aminium chloride nanoparticles using a particulate calibration standard
High-accuracy effective density measurements of sodium methanesulfonate and aminium chloride nanoparticles using a particulate calibration standard
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DOI：
10.1080/02786826.2023.2176739
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发表时间：
2023-02
影响因子：
5.2
通讯作者：
V. Perraud;James N. Smith;J. Olfert
中科院分区：
文献类型：
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作者：
V. Perraud;James N. Smith;J. Olfert
摘要甲烷磺酸盐和铵盐是环境纳米粒子中常见的两种有机物，常用作校准标准。然而，如果要将这些标准品用于校准气溶胶质谱仪或从电动平衡实验中估计吸湿生长因子，则需要这些标准品产生的颗粒的有效密度。使用离心式颗粒质量分析仪和扫描迁移率粒度仪串联（CPMA-SMPS）来测量五种盐的有效密度。其有效密度分别为：甲磺酸钠，1474 ± 13 kg m−3;甲基氯化铵，1236 ± 29 kg m−3;单乙醇胺盐酸盐，1136 ± 26 kg m−3; 1，4-二氨基丁烷二盐酸盐，1135 ± 33 kg m−3; NaCl由于其非球形形状，其有效密度与尺寸有关。还展示了如何使用Santovac®真空泵油来精确校准直径小于100 nm的颗粒的CPMA-SMPS系统，这是一个依赖于聚苯乙烯乳胶球的校准技术存在问题的尺寸范围。版权所有© 2023美国气溶胶研究协会
Abstract Methanesulfonate and aminium salts are commonly found in ambient nanoparticles and are often used as calibration standards. However, the effective densities of the particles generated from these standards are required if they are to be used to calibrate aerosol mass spectrometers or to estimate hygroscopic growth factors from electrodynamic balance experiments. A centrifugal particle mass analyzer and scanning mobility particle sizer were used in tandem (CPMA-SMPS) to measure the effective density of five salts. The effective densities were determined to be: sodium methanesulfonate, 1474 ± 13 kg m−3; methylammonium chloride, 1236 ± 29 kg m−3, monoethanolamine hydrochloride, 1136 ± 26 kg m−3; 1,4-diaminobutane dihydrochloride, 1135 ± 33 kg m−3; and NaCl was found to have a size-dependent effective density due to its non-spherical shape. It is also shown how Santovac® vacuum pump oil can be used to accurately calibrate the CPMA-SMPS system for particles less than 100 nm in diameter, which is a size range that has been problematic for calibration techniques relying on polystyrene latex spheres. Copyright © 2023 American Association for Aerosol Research