An affordable, water-based, community condensation particle counter.

IF 2.1 4区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL
Susanne Hering, Stavros Amanatidis, Arantza Eiguren-Fernandez, Gregory S Lewis, Steven R Spielman, David Pariseau
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Abstract

A "Community Condensation Particle Counter" (cCPC) has been developed to provide an affordable monitor of airborne particle number concentrations. The cCPC is an expansion-type condensation particle counter that incorporates single particle counting to yield a direct measurement of number concentration. Particle number concentrations are derived from the detection of individual droplets exiting the cell during the expansion, combined with the pressure readings and the physical volume of the particle cell. Modeling and experiment confirm detection of particles as small as 4 nm, with >95% detection above 20 nm. For 12 days of ambient sampling two collocated cCPCs exhibit a pooled standard deviation of 3.5%. Comparison to a pair of benchtop instruments (ADI MAGIC CPCs) yields a correlation of R2=0.98 and a regression slope of 1.1. Laboratory studies at concentrations higher than 3×104 cm-3 for both sulfate and dioctyl sebacate show equally reduced response when compared to a versatile water CPC, but this was not observed in ambient aerosol sampling. Further research will be needed to resolve this discrepancy.

一个经济实惠的,水基的,社区凝结粒子计数器。
“社区凝结粒子计数器”(cCPC)已被开发,以提供一个负担得起的监测空气中的粒子数量浓度。cCPC是一种膨胀型冷凝粒子计数器,它结合了单粒子计数来产生数字浓度的直接测量。颗粒数浓度来源于膨胀过程中单个液滴离开细胞的检测,结合压力读数和颗粒细胞的物理体积。通过建模和实验,可以检测到小至4 nm的颗粒,在20 nm以上的颗粒中,>的检出率为95%。在12天的环境采样中,两个并置的cCPCs显示出3.5%的总标准差。与一对台式仪器(ADI MAGIC cpc)的比较得出R2=0.98的相关性和1.1的回归斜率。实验室研究表明,在浓度高于3×104 cm-3时,硫酸盐和癸酸二辛酯的反应与多用途水CPC相比同样降低,但在环境气溶胶采样中未观察到这一点。需要进一步的研究来解决这一差异。
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来源期刊
Aerosol Science and Technology
Aerosol Science and Technology 环境科学-工程:化工
CiteScore
8.40
自引率
7.70%
发文量
73
审稿时长
3 months
期刊介绍: Aerosol Science and Technology publishes theoretical, numerical and experimental investigations papers that advance knowledge of aerosols and facilitate its application. Articles on either basic or applied work are suitable. Examples of topics include instrumentation for the measurement of aerosol physical, optical, chemical and biological properties; aerosol dynamics and transport phenomena; numerical modeling; charging; nucleation; nanoparticles and nanotechnology; lung deposition and health effects; filtration; and aerosol generation. Consistent with the criteria given above, papers that deal with the atmosphere, climate change, indoor and workplace environments, homeland security, pharmaceutical aerosols, combustion sources, aerosol synthesis reactors, and contamination control in semiconductor manufacturing will be considered. AST normally does not consider papers that describe routine measurements or models for aerosol air quality assessment.
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