Development,verification and application of a versatile aerosol calibration system for online aerosol instruments |
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| Institution: | 2. Zhang Jia International Co., LTD, Taipei, Taiwan, China;3. Institute of Environmental and Occupational Health Sciences, College of Public Health, Taiwan University, Taipei, Taiwan, China;4. Shanghai Environmental Monitoring Center, Shanghai, 200235, China;5. IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health, Fudan University, Shanghai, 200433, China;6. Institute of Eco-Chongming (IEC), Shanghai, 202162, China;1. Institute of Semiconductor Technology (IHT), Technische Universität Braunschweig, Hans-Sommer-Straße 66, D-38106 Braunschweig, Germany;2. Laboratory for Emerging Nanometrology (LENA), Braunschweig, D-38106, Germany;3. Material Analysis and Indoor Chemistry Department (MAIC), Fraunhofer-Wilhelm-Klauditz-Institut (WKI), Bienroder Weg 54E, D-38108 Braunschweig, Germany;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China;3. The Joint Laboratory of MXene Materials, Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, China;4. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China;1. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, Lanzhou University, Lanzhou, 730000, China;2. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Lanzhou, 730000, China;1. State Key Lab of Materials Forming and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore |
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| Abstract: | Traditional calibration methods mostly focus on the calibration of detection systems while the calibration from the sampling and pre-condition systems to the detection system is usually ignored. In this regard, a Primary Standard Aerosol Mass Concentration Calibration System (PAMAS) is developed for the whole-process calibration of time-resolved aerosol measurement instruments. PAMAS is composed of a particle generation chamber, an ultrasonic atomizer, a dilution system, and a syringe pump. It is designed to steadily generate standard aerosol particles of known concentrations (≤250 μg/m3), chemical compositions, and stable particle size distributions. Monodispersed aerosol can be generated in the size range of hundreds of nanometers to several micrometers with a narrow size distribution. The generated particles with different compositions generated by PAMAS have been well verified by the filter-based gravimetric method, yielding accuracy and R2 of more than 95% and 0.999 in a wide concentration range. The response time by changing the target concentration of reference particles is 1–2 min. PAMAS has been applied to various types of time-resolved aerosol measurement instruments, including particle mass concentration monitors (Beta Attenuation and Tapered Element Oscillating Microbalance), online Ion Chromatograph, and semi-continuous OCEC carbon aerosol analyzer. Very consistent results between PAMAS and calibrated instruments can be obtained if the instruments are functioning well. As for instruments with certain technical issues, PAMAS can serve as a good tool for performance evaluation and quality assurance of the instruments and the accuracy of the measurement data can be adjusted based on the calibration results. |
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| Keywords: | PAMAS Whole-process calibration Time-resolved aerosol measurement instruments |
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