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| Titel: |
An Ultrafine, Water-Based Condensation Particle Counter and its Evaluation under Field Conditions |
| Auteur: |
Iida, Kenjiro Stolzenburg, Mark R. McMurry, Peter H. Smith, James N. Quant, Frederick R. Oberreit, Derek R. Keady, Patricia B. Eiguren-Fernandez, Arantza Lewis, Gregory S. Kreisberg, Nathan M. Hering, Susanne V. |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 42 (2008) nr. 10 pagina's 862-871 |
| Jaar: |
2008-10 |
| Inhoud: |
An ultrafine, water-based condensation particle counter (U-WCPC, TSI Model 3786) has been compared to a butanol-based ultrafine counter (U-BCPC, TSI Model 3025) for measurement of atmospheric and freeway-tunnel aerosols. The U-WCPC utilizes a warm, wet-walled growth tube to activate and grow particles through water condensation in a laminar-flow. It has an aerosol sampling rate of 0.3 L/min, and a nominal detection limit near 3 nm. Several field comparisons were made to the butanol-based instrument with the same nominal detection limit. For measurements of size-selected aerosols with diameters of 5 nm and larger the two instruments generally agreed, with a mean response within 5%. At 3 nm particle size differences were observed, and these differences varied with the data set. Measurements of ambient aerosol in Boulder, Colorado showed higher counting efficiency at 3 nm with the U-BCPC, while in a California freeway tunnel the opposite trend was observed, with higher counting efficiencies at 3 nm observed by the U-WCPC. For direct measurement of atmospheric aerosols, the two types of instruments yielded equivalent concentrations, independent of particle number concentration. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 8 gevonden artikelen
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