Measurement report: Evaluation of the TOF-ACSM-CV for PM 1.0 and PM 2.5 measurements during the RITA-2021 field campaign

Liu, Xinya; Henzing, Bas; Hensen, Arjan; Mulder, Jan; Yao, Peng; van Dinther, Danielle; van Bronckhorst, Jerry; Huang, Rujin; Dusek, Ulrike

The recently developed time-of-flight aerosol chemical speciation monitor with a capture vaporizer and a PMinline-formula2.5 aerodynamic lens (TOF-ACSM-CV-PMinline-formula2.5) aims to improve the collection efficiency and chemical characterization of aerosol particles with a diameter smaller than 2.5 inline-formulaµm. In this study, comprehensive cross-comparisons were performed between real-time online measurements and offline filter analysis with 24 h collection time. The goal was to evaluate the capabilities of the TOF-ACSM-CV-PMinline-formula2.5 lens, as well as the accuracy of the TOF-ACSM-CV-PMinline-formula2.5. The experiments were conducted at Cabauw Experimental Site for Atmospheric Research (CESAR) during the RITA-2021 campaign. The non-refractory fine particulate matter (PMinline-formula1.0 and PMinline-formula2.5) was measured by two collocated TOF-ACSM-CV-PMinline-formula2.5 instruments by placing them behind a PMinline-formula2.5 and PMinline-formula1.0 inlet, respectively. A comparison between the ACSMs and PMinline-formula2.5 and PMinline-formula1.0 filter samples showed a much better accuracy than inline-formula±30 % less given in the previous reports, with average differences less than inline-formula±10 % for all inorganic chemical species. In addition, the ACSMs were compared to the Monitoring Instrument for Aerosol and Gas (MARGA) (slope between 0.78 and 0.97 for inorganic compounds, inline-formulaR2 0.93) and a mobility particle size spectrometer (MPSS), measuring the particle size distribution from around 10 to 800 nm (slope was around 1.00, inline-formulaR2= 0.91). The intercomparison of the online measurements and the comparison between the online and offline measurements indicated a low bias (inline-formula< 10 % for inorganic compounds) and demonstrated the high accuracy and stability of the TOF-ACSM-CV-PMinline-formula2.5 lens for the atmospheric observations of particle matter. The two ACSMs exhibited an excellent agreement, with differences less than 7 %, which allowed a quantitative estimate of PMinline-formula1.0 vs. PMinline-formula2.5 chemical composition. The result showed that the PMinline-formula1.0 accounted for about 70 %–80 % of the PMinline-formula2.5 on average. The NOinline-formula3 mass fraction increased, but the organic carbon (OC) mass fraction decreased from PMinline-formula1.0 to PMinline-formula2.5, indicating the size dependence on chemical composition.



Liu, Xinya / Henzing, Bas / Hensen, Arjan / et al: Measurement report: Evaluation of the TOF-ACSM-CV for PM1.0 and PM2.5 measurements during the RITA-2021 field campaign. 2024. Copernicus Publications.


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