Monitoring Hydrofluoric Acid Activity by Vapor-Phase Infrared Spectroscopy

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Abstract:

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.

Keywords: Hydrofluoric acid; Infrared absorption; Plutonium processing

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702944029947

Affiliations: 1: Spectroscopy and Biochemistry Group, CST-14; MS-C345, Los Alamos National Laboratory, Los Alamos, New Mexico 87545; present address: Department of Chemistry, Furman University, Greenville, SC 29613 2: Spectroscopy and Biochemistry Group, CST-14; MS-C345, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Publication date: July 1, 1994

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