11:30am - 11:45amMO2-1: 1
Findings from a one year measurement campaign of the number concentration and number size distribution with MPSS, CPC and Partector 2 Pro
Christof Asbach1, Ana Maria Todea1, Hannes Brauer2, Marleen Marquardt2, Robert Zimmermann2, Sebastian Steinau3, Gerhard Steiner3
1Institut für Umwelt & Energie, Technik & Analytik e. V. (IUTA), Germany; 2Landesamt für Umwelt (LfU) Brandenburg, Germany; 3Grimm Aerosol Technik GmbH, Germany
The UFP number concentration and number size distribution have been measured at an urban background site in Wildau (Brandenburg, Germany) during the entire year 2024. The employed measurement devices included a Condensation Particle Counter (Grimm 5421-CEN), fully compliant with EN16976 and a Mobility Particle Size Spectrometer (Grimm SMPS+C 5420-CEN) according to CEN/TS 17434. In addition, a Partector 2 and Partector 2 Pro (naneos) were employed as simplified methods to measure the number concentration and size distribution, respectively. The results show that all devices can reliably be applied with reasonably good comparability of the results.
11:45am - 12:00pmMO2-1: 2
Harmonization of MPSS instruments with respect to data inversion bias by intercomparison against a reference MPSS
Stergios Vratolis1, Jakub Ondracek2, Petr Roztočil2, Vladimir Zdímal2, Konstantinos Eleftheriadis1
1NCSR Demokritos, Greece; 2ICPF, Czech Republic
In the context of the project “MITIGATING TRANSPORT-RELATED AIR POLLUTION IN EUROPE (MI-TRAP)”, an MPSS calibration workshop took place in Prague, Czech Republic from November 25, 2024 to December 2, 2024. One of the participating instruments (a negative polarity MPSS) displayed significant difference (~25%) from the reference MPSS (positive polarity). A regularization based inversion method was applied so as to harmonize measurements acquired by the participating instrument with those obtained from a reference instrument.
12:00pm - 12:15pmMO2-1: 3
Traceable Calibration of Ultrafine Particle Instrumentation
Gerhard Steiner1, Christian Kunath1, Erik Merker1, Lothar Keck1, Christian Krause2, Martin Götz2
1Grimm Aerosol Technik, Germany; 2PTB Braunschweig and Berlin, Germany
Faraday Cup Aerosol Electrometers (FCAE) are the preferred reference instrument for CPCs used stand alone or used as detector in an MPSS setup. So far, the standard method to calibrate FCAE involves rather extensive and stationary instrumentation, involving high precision laboratory-based instrumentation, mostly only available at dedicated national metrology institutes that also have specialized in the field of low current measurement. Here we present data and the use of a commercially available Ultra-stable Low-noise Current Amplifier (ULCA) for the calibration of a GRIMM FCE 5705, teamed up with the newly developed GRIMM FCE Controller 5704.
12:15pm - 12:30pmMO2-1: 4
Beyond CEN-compliant ambient aerosol monitoring: 10 nm calibration of a water-based Condensation Particle Counter (WCPC)
Torsten Tritscher1, Sebastian H. Schmitt1, Carsten Kykal1, Oliver F. Bischof1,2
1TSI GmbH, Germany; 2Forschungszentrum Jülich GmbH, Germany
Condensation Particle Counters (CPCs) are widely-used instruments for atmospheric measurements of the particle number (PN) concentration. EN 16976:2024 compliant CPC work with butanol and have D50 of 10 nm. A water-based V-WCPC (3789) allows custom temperature settings and was calibrated. It was found that the different temperature settings from calibrations with sucrose and silver (in N2) particles were different and then used to measure ambient aerosol with 3 units of V-WCPC and in parallel with a fully compliant CPC (3750-CEN10). They show an overall good agreement for ambient air in Aachen when using the sucrose-based calibration for the V-WCPC.
|