| Zugriffsnummer | 32740 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | EURAMET comparison 1244 : comparison of aerosol electrometers ; EURAMET Report |
| Autor(in); Institution |
Quincey, Paul; National Physical Laboratory, Analytical Science Division, Teddington, UK
Sarantaridis, Dimitris; National Physical Laboratory, Analytical Science Division, Teddington, UK
Yli-Ojanperä, Jaakko; Tampere University of Technology (TUT), Tampere, FINLAND
Keskinen, Jorma; Tampere University of Technology (TUT), Tampere, FINLAND
Högström, Richard; MIKES, Centre for Metrology and Accreditation, Espoo, FINLAND
Heinonen, Martti; MIKES, Centre for Metrology and Accreditation, Espoo, FINLAND
Lüönd, Felix; Federal Institute of Metrology (METAS), Bern - Wabern, SWITZERLAND
Nowak, Andreas; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Riccobono, Francesco; European Commission, Joint Research Centre (JRC), Ispra, ITALY
Tuch, Thomas; Leibniz Institute für Troposphärenforschung (TROPOS), Leipzig, GERMANY
Sakurai, Hiromu; National Metrology Institute of Japan (NMIJ) Umezono, JAPAN; National Institute of Advanced Industrial Science and Technology (AIST),Tsukuba, JAPAN
Owen, Miles; US Army Primary Standards Laboratory (APSL), Redstone Arsenal, USA
|
| Quelle/Jahr | (2014), 2 |
| Schriftenreihe | NPL Report AS: 85 |
| ISSN | 1754-2928 |
| Berichtsnummer | NPL Report AS 85 |
| Verlag | National Physical Laboratory: Teddington |
| Zusammenfassung | Aerosol particle number concentration has recently featured in vehicle emission legislation and is becoming increasingly important in other areas such as ambient air monitoring. Number concentration measurements are also often integral to particle size distribution measurements, such as when using a Mobili ty Particle Size Spectrometer. The draft ISO standard ISO/DIS 27891 describes a calibration procedure for Condensation Particle Counters (CPCs -the usual type of instrument for measuring particle number concentration in the size range from a few nano meters to a few micrometers) by reference to an aerosol electrometer. If a source of singly - charged particles is used, number concentration (typically in units of cm-3) is directly comparable to charge concentration (eg in fC.cm-3). The DIS refers to the role of NMIs in providing certification for both reference aerosol electrometers and reference CPCs. The aim of this comparison was to compare the results of different laboratories’ measurements of charge concentration – in practice the combination of electrometer current (eg in fA), air flow (eg in cm3 s.) and any losses of particles within the instrument. The comparison took place at the Tampere University of Technology in Finland in March 2013 as part of the EMRP project ENV02 PartEmission (Automotive combustion particle metrics), Deliverable 1.2.2. Because this is the first multi - NMI comparison of aerosol electrometers, EURAMET participants were joined by other participants with strong metrological expertise in this area. The comparison included aerosol charge concentrations between about 0.15 and 3 fC cm-3, and aerosol particle sizes from 6 to 200 nm, using aerosol particles composed of di-octyl sebacate, NaCl and soot. The results suggest that, away from low charge concentration and low particle size, agreement to ±3 % between reference laboratories using different designs of instrument is already typical, and that uncertainties of less than ±1% (2σ) are achievable. |
Zitierung
Quincey, P., Sarantaridis, D., Yli-Ojanperä, J., Keskinen, J., Högström, R., Heinonen, M., Lüönd, F., Nowak, A., Riccobono, F., Tuch, T., Sakurai, H., & Owen, M. (2014). EURAMET comparison 1244 : comparison of aerosol electrometers ; EURAMET Report (Report No. NPL Report AS 85). National Physical Laboratory: Teddington.