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Effect of relative humidity on the performance of five cost-effective PM sensors
Aerosol Science and Technology ( IF 5.2 ) Pub Date : 2021-04-14 , DOI: 10.1080/02786826.2021.1910136
Peng Wang 1 , Feng Xu 1, 2 , Huaqiao Gui 3 , Huanqin Wang 1, 2 , Da-Ren Chen 1
Affiliation  

Abstract

In this work, the effect of relative humidity, RH, on the readouts of five light-scattering-based PM sensors were investigated by using particles composed of different hydroscopic materials and comparing the readouts with those measured by Tapered Element Oscillating Microbalance (TEOM). It was found the RH has various effects on the readouts of PM sensors, highly depending on the hydroscopic property of particles. Negligible RH effect on the PM sensors’ readouts was observed for hydrophobic particles while significant increase in the readouts was observed for hydroscopic particles at the RH setting higher than the deliquescence relative humidity, DRH, of particle materials. For particles in the binary components, the effect of the mixture deliquescence on the sensor readouts depends on the hygroscopicity of composite materials (e.g., NaCl + Glucose; NaCl + OA; NaCl + K2SO4). In the case of NaCl + OA, the water uptake of resultant NaCl + OA particles is less than that of pure NaCl and OA (because of the possible formation of less hygroscopic di-sodium oxalate, Na2C2O4, in particles). The readouts of PM sensors were also influenced by the mixing status of particles, i.e., internally vs. externally mixed. The correlation slopes for different PM sensors were compared. More, the sampling misalignment was found affecting the readouts of some PM sensors. It is thus suggested to calibrate PM sensors using field particles under the application environments for getting PM data in good quality (assuming that the seasonal change of field RH, and the size distribution and composition of field particles is minor).

Copyright © 2021 American Association for Aerosol Research



中文翻译:

相对湿度对五种具有成本效益的 PM 传感器性能的影响

摘要

在这项工作中,通过使用由不同吸湿材料组成的颗粒并将读数与锥形元件振荡微量天平 (TEOM) 测量的读数进行比较,研究了相对湿度 RH 对五个基于光散射的 PM 传感器读数的影响。发现 RH 对 PM 传感器的读数有多种影响,很大程度上取决于颗粒的吸湿性。对于疏水性颗粒,观察到对 PM 传感器读数的 RH 影响可以忽略不计,而在高于颗粒材料的潮解相对湿度 DRH 的 RH 设置下,对于吸湿颗粒,观察到读数显着增加。对于二元组分中的粒子,混合物潮解对传感器读数的影响取决于复合材料的吸湿性(例如,氯化钠 + 葡萄糖;氯化钠 + OA; 氯化钠+钾2 SO 4)。在 NaCl + OA 的情况下,所得 NaCl + OA 颗粒的吸水率低于纯 NaCl 和 OA(因为可能形成吸湿性较低的草酸二钠 Na 2 C 2 O 4,在粒子中)。PM 传感器的读数也受到颗粒混合状态的影响,即内部混合与外部混合。比较了不同 PM 传感器的相关斜率。此外,发现采样错位会影响一些 PM 传感器的读数。因此建议在应用环境下使用场粒子校准 PM 传感器,以获得高质量的 PM 数据(假设场 RH 的季节性变化,以及场粒子的尺寸分布和组成很小)。

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更新日期:2021-04-14
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