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EURAMET Comparison 1282: Comparison of condensation particle counters. Final Report.

Quincey, P G; Sarantaridis, D; Tuch, T*; Yli-Ojanperä, J*; Högström, R*; Lüönd, F*; Nowak, A*; Jordan-Gerkens, A*; Riccobono, F*; Iida, K*; Sakurai, H*; Owen, M* (2014) EURAMET Comparison 1282: Comparison of condensation particle counters. Final Report. NPL Report. AS 94

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Abstract

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 Mobility Particle Size Spectrometer.

The draft ISO standard ISO/DIS 27891 [1] 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 nanometers to a few micrometers) either by reference to an aerosol electrometer, or to a reference CPC. 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 particle number concentration using CPCs (in cm-3).

The comparison took place at the Leibniz Institute for Tropospheric Research (TROPOS) in October 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 CPCs, EURAMET participants were joined by other participants with strong metrological expertise in this area.

The comparison included aerosol particle concentrations between about 100 and 20,000 cm-3, and aerosol particle sizes from 13 to 100 nm, using aerosol particles composed of unsintered silver, sintered silver and soot. The results show discrepancies between instruments with a relatively high (23 nm) 50% cut-off size, even at aerosol particle sizes well above the cut-off size. Apart from this, the results showed that for the full concentration range, and sizes between 23 and 100 nm, agreement to ±10% between reference laboratories is currently achieved.

Item Type: Report/Guide (NPL Report)
NPL Report No.: AS 94
Subjects: Analytical Science
Analytical Science > Gas Standards
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6453

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