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| Titel: |
Evaluation of the Performance of Annular Denuder Samplers |
| Auteur: |
Pang, Yanbo Eatough, Norman L. Eatough, Delbert J. |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 36 (2002) nr. 6 pagina's 790-798 |
| Jaar: |
2002-06 |
| Inhoud: |
Two annular denuder samplers were evaluated for the determination of atmospheric nitric acid, SO 2 , and fine particulate sulfate and nitrate. One, the University Research Glassware (URG) sampler, used an elutriator-impactor to remove coarse particles prior to sampling the aerosol through the denuder sections for the removal of acid gases. The second, the Rupprecht and Patashnick (R&P) ChemSpec, removes the acid gases in diffusion denuder sections and then removes coarse particles prior to the collection of fine particles. Possible sampling artifacts examined included the removal of HNO 3 (g) by the inlet of the URG sampler before the collection of this gas-phase species by the diffusion denuder, resulting in the underestimation of HNO 3 (g) and the deposition of some coarse particles in the R&P denuders prior to the removal of these larger particles, and the collection of fine particles on a filter, resulting in the overestimation of HNO 3 (g) and SO 2 (g). Samples were collected in Riverside, CA, Bakersfield, CA, and Provo, UT. Both sampling artifacts were found to be present. However, the effect on the determination of HNO 3 (g) by the URG sampler and on the determination of particulate-phase sulfate and nitrate by the R&P ChemSpec were both small, on the order of a few tenths of a microgram per cubic meter. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 14 gevonden artikelen
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