An Intermethod Comparison of X-ray Photoelectron Spectroscopic (ESCA) Analysis of Atmospheric Particulate Matter
| Autor: | T. Novakov, S. G. Chang, J. J. Wesolowski, E. M. Hoffer, S. Wall, S. Twiss, B. R. Appel |
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| Rok vydání: | 1976 |
| Předmět: |
Health
Toxicology and Mutagenesis Inorganic chemistry Ultra-high vacuum Public Health Environmental and Occupational Health Soil Science chemistry.chemical_element Particulates Pollution Analytical Chemistry Atmosphere chemistry.chemical_compound chemistry Nitrate Nitric acid Environmental Chemistry Ammonium Sulfate Waste Management and Disposal Carbon Water Science and Technology |
| Zdroj: | International Journal of Environmental Analytical Chemistry. 4:169-181 |
| ISSN: | 1029-0397 0306-7319 |
| DOI: | 10.1080/03067317608071112 |
| Popis: | A comparison of ESCA with wet chemical and other analytical techniques has demonstrated agreement within about a factor of 2 for sulfate and carbon but gave much larger deviations for nitrate and ammonium in analysis of atmospheric particulate samples collected in California's South Coast Basin. Analyses for nitrate and ammonium were low by a factor of 5 to 10 relative to the wet chemical methods. Loss of volatile ammonium- and nitrate-containing materials under the high vacuum and localized X-ray beam-induced heating conditions of ESCA was the most reasonable explanation of the discrepancy. Detailed temperature programmed ESCA studies support this conclusion and suggest the significance of highly volatile nitrate (e.g. nitric acid) and ammonium compounds in the atmospheric particles. |
| Databáze: | OpenAIRE |
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