Abstract
Response of two commercial quartz crystal aerosol mass monitor (TSI Model 3200A and 3500) to several sulfate and nitrate aerosols has been examined in terms of linerity, mass sensitivity and hygroscopicity. For all the aerosols tested, the mass monitor responded linearly (± 15% variation) to mass loadings on the sensing crystal up to an accumulated frequency change of 1000 Hz in Model 3200A and 4000 Hz in Model 3500. Within this linearity limit, the mass sensitivity tended to increase gradually with increase of mass loading. The mass sensitivity coefficient ( S) of the monitor varied from 135 to 219 Hz/μg with 0.5 μm MMAD (GSD = 1.5) aerosols, depending upon the kind of aerosols and was 10–26% higher with 1.2 μm MMAD aerosols. The monitors responded sensitively and correctly to hygroscopic nature of the aerosols tested. showing sharp increases of frequency change at known deliquescent points of the aerosols.
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