Second Generation Micro-Orifice Uniform Deposit Impactor, 120 MOUDI-II: Design, Evaluation, and Application to Long-Term Ambient Sampling
| Autor: | Virgil A. Marple, Bernard A. Olson, Stephen D Monson Geerts, George J Hudak, Dale A. Lundgren, Francisco J. Romay |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Aerosol Science and Technology. 48:427-433 |
| ISSN: | 1521-7388 0278-6826 |
| DOI: | 10.1080/02786826.2014.884274 |
| Popis: | The original MOUDI (Micro-Orifice Uniform Deposit Impactor) cascade impactor, reported in the literature in 1991, used an external gear system to achieve a uniform deposit and was intended for industrial hygiene studies with sample times in the range of minutes to a few hours. To facilitate much longer run times, a second generation MOUDI, MOUDI-II, which uses internal electric motors to rotate the impaction plates, was developed. Three model 120 MOUDI-IIs were used in a 32-month program to sample ambient atmospheric aerosols at several industrial and urban locations in Minnesota. For these sampling locations, each 120 MOUDI-II operated continuously for a minimum of five, and optimally 7 days, to collect a sample at a site. During these community sampling events, the three 120 MOUDI-IIs logged 4007, 2637, and 3230 h of operating time, respectively. A laboratory side-by-side comparison of the three 120 MOUDI-IIs showed good agreement amongst the three 120 MOUDI-IIs and, thus, the particle size distribution... |
| Databáze: | OpenAIRE |
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