Infrared spectra of solid films formed from vapors containing water and nitric acid

1991 ◽  
Vol 95 (15) ◽  
pp. 5924-5930 ◽  
Author(s):  
Roland H. Smith ◽  
Ming Taun Leu ◽  
Leon F. Keyser
Keyword(s):  
Nitric Acid ◽  
Infrared Spectra ◽  
Solid Films

THE INFRARED SPECTRA AND PHASE TRANSITIONS OF SOLID PIPERIDINIUM HALIDES

1962 ◽  
Vol 40 (4) ◽  
pp. 615-621 ◽  
Author(s):  
A. Cabana ◽  
C. Sandorfy
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Infrared Spectra ◽  
Low Temperatures ◽  
Room Temperature ◽  
Solid Films

The infrared spectra of solid films of piperidinium halides were measured at both room temperature and low temperatures. The spectra of the chloride and the bromide are not appreciably affected by cooling, but the spectrum of the iodide exhibits spectacular changes. These changes are explained by assuming the occurrence of a phase transition at about −15 °C. The possibility of a "chair" → "boat" interconversion is also discussed.

scholarly journals Variation of the infrared spectra of nitric acid hydrates with formation conditions: Impact on PSC identification

1999 ◽  
Vol 26 (6) ◽  
pp. 707-710 ◽  
Author(s):  
Robert T. Tisdale ◽  
Anthony J. Prenni ◽  
Laura T. Iraci ◽  
Margaret A. Tolbert ◽  
O. B. Toon
Keyword(s):  
Nitric Acid ◽  
Infrared Spectra ◽  
Formation Conditions

Monitoring Hydrofluoric Acid Activity by Vapor-Phase Infrared Spectroscopy

1994 ◽  
Vol 48 (7) ◽  
pp. 808-812 ◽  
Author(s):  
Keith R. Brenneman ◽  
Robert J. Donohoe
Keyword(s):  
Infrared Spectroscopy ◽  
Nitric Acid ◽  
Vapor Phase ◽  
Infrared Spectra ◽  
Acid Content ◽  
Hydrofluoric Acid ◽  
Spectroscopic Methods ◽  
Kcal Mole ◽  
Process Solutions ◽  
Nitric Acid Content

Infrared spectra of the vapor phase over solutions approximating those used in the dissolution of plutonium, typically 10 M in nitric acid and 0.2 M in hydrofluoric acid, reveal that the hydrofluoric acid (HF) activity can be monitored in a facile and noninvasive manner. The amount of vaporized HF is strongly dependent upon the nitric acid content; the vapor-phase HF content over a series of solutions in which the HF concentration is held constant at 0.5 M increases by a factor of nearly 25 as the HNO3 concentration is increased from 0 to 14 M. This effect is due to changes in the HF activity and is not a result of changes in the heat of vaporization, which was measured (by van't Hoff plots) to be 9.4 ± 0.6 kcal/mole for 16 mock process solutions ranging from 0.01 to 0.1 M HF and 8 to 14 M HNO3. This result demonstrates that spectroscopic methods can use the vaporization of an analyte to measure the activity rather than the concentration.

Sign in / Sign up

Export Citation Format

Share Document