Direct observation of heterogeneous chemistry in the atmosphere
| Autor: | Gard EE; E. E. Gard, D. S. Gross, B. D. Morrical, D. P. Fergenson, T. Dienes, M. E. Galli, K. A. Prather, Department of Chemistry, University of California, Riverside, CA 92521, USA. M. J. Kleeman, L. S. Hughes, J. O. Allen, R. J. Johnson, G. R. Cass, Departme., Kleeman MJ, Gross DS, Hughes LS, Allen JO, Morrical BD, Fergenson DP, Dienes T, E Galli M, Johnson RJ, Cass GR, Prather KA |
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| Jazyk: | angličtina |
| Zdroj: | Science (New York, N.Y.) [Science] 1998 Feb 20; Vol. 279 (5354), pp. 1184-7. |
| DOI: | 10.1126/science.279.5354.1184 |
| Abstrakt: | The heterogeneous replacement of chloride by nitrate in individual sea-salt particles was monitored continuously over time in the troposphere with the use of aerosol time-of-flight mass spectrometry. Modeling calculations show that the observed chloride displacement process is consistent with a heterogeneous chemical reaction between sea-salt particles and gas-phase nitric acid, leading to sodium nitrate production in the particle phase accompanied by liberation of gaseous HCl from the particles. Such single-particle measurements, combined with a single-particle model, make it possible to monitor and explain heterogeneous gas/particle chemistry as it occurs in the atmosphere. |
| Databáze: | MEDLINE |
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