AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Experimental Evaluation of Mass Measurement Accuracy of Two Commercial Aerosol Particle Mass Analyzers in Sub-100 nm Range
HIROMU SAKURAI, Yoshiko Murashima, AIST
Abstract Number: 266 Working Group: Instrumentation and Methods
Abstract Two commercial aerosol particle mass analyzers, namely Kanomax APM 3601 and Cambustion CPMA, were experimentally compared on the mass measurement accuracy in the size range between 12 nm and 200 nm. Laboratory-generated monodispersed aerosol particles that were size classified by a differential electrical mobility classifier (DEMC) were fed simultaneously into the two instruments that measured the number-weighted mass distribution of the fed aerosol. For each size, the mode masses determined by the two instruments were compared to the mass calculated from the particle size set on the DEMC and the material density assuming that the particles were spherical. At 100 nm and 200 nm, the measured and calculated masses agreed with each other for both instruments within 5 %. At 20 nm and 30 nm, the measured masses by the two instruments agreed with each other within 5 %, but underestimated the calculated mass by about 10 %. At 12 nm and 15 nm, the two instruments gave very different masses. On one hand, the masses by the APM underestimated the calculated mass by about 30 %. On the other hand, the mass by the CPMA overestimated the calculated mass by about 20 % and 90 % at 15 nm and 12 nm, respectively. The reason for the difference in the mass measurement performance between the two instrument at 12 nm and 15 nm was not identified.