| Autor: |
Mark S. Zahniser, Joanne H. Shorter, Kenneth H. Shafer, David R. Nelson, Milton E. Parrish, Susan E. Plunkett |
| Rok vydání: |
2001 |
| Předmět: |
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| Zdroj: |
Vibrational Spectroscopy. 27:53-63 |
| ISSN: |
0924-2031 |
| DOI: |
10.1016/s0924-2031(01)00121-7 |
| Popis: |
An infrared spectroscopic technique has been developed to measure ammonia, ethylene, and formaldehyde in single puffs of whole cigarette smoke with millisecond resolution. Since formaldehyde levels in smoke decrease with increasing ammonia levels, this effect was studied by simultaneous measurement of the two compounds during a puff. Ethylene was measured since it is inert and hydrophobic. The spectral lines chosen for quantitation were determined to be linear with concentration and free from interferences from other smoke constituents. The limit of detection for ammonia at 965.353 cm −1 was 2 ng (80 ppbv) and for ethylene at 965.459 cm −1 was 324 ng (8 ppmv) in a puff of 35 ml volume and 2 s duration. Others have reported that hydrazine is present in smoke at 70 ppbv per puff using trapping and derivatization methods. Attempts here to detect hydrazine in smoke without trapping and derivatization were unsuccessful at the current limit of detection of 25 ppm in the 958 cm −1 spectral region. This limit is due to interferences from unidentified smoke components. The reactivity of hydrazine in smoke was determined by adding 520 ppm hydrazine to the smoke matrix, where 83% was consumed in the first second of a three-second sample. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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