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Abstract. Effective density is a crucial parameter used to predictthe transport behaviour and fate of particles in the atmosphere, and tomeasure instruments used ultimately in the human respiratory tract(Ristimaki et al., 2002). The aerosol particle mass analyser (APM) wasfirst proposed by Ehara et al. (1996) and is used to determine the effectivedensity of aerosol particles. A compact design (Kanomax APM-3601) wassubsequently developed by Tajima et al. (2013). Recently, a growing numberof field studies have reported application of the APM, and experimentalschemes using the differential mobility analyser alongside the APM have beenadopted extensively. However, environmental conditions such as ambientpressure and temperature vary with the experimental location, and this couldaffect the performance of the APM. Gas viscosity and Cunningham slip factorsare parameters associated with temperature and pressure and are included inthe APM's classification performance parameter: λ . In this study,the effects of temperature and pressure were analysed through theoreticalcalculation, and the influence of varying carrier gas was experimentallyevaluated. The transfer function and APM operational region were furthercalculated and discussed to examine their applicability. Based on thetheoretical analysis of the APM's operational region, the mass detectionlimits are changed with the properties of carrier gases under a chosen λ value. Moreover, the detection limit can be lowered when thepressure is reduced, which implies that performance may be affected duringfield study. In experimental evaluation, air, oxygen, and carbon dioxidewere selected to atomize aerosols in the laboratory with the aim ofevaluating the effect of gas viscosity on the APM's performance. Usingmonodisperse polystyrene latex (PSL) spheres with nominal diameters of 50and 100 nm, the classification performance of the APM was slightly variedwith carrier gases, while the classification accuracy was consistentlywithin 10 %.

Effects of temperature, pressure, and carrier gases on the performance of an aerosol particle mass analyser