Formation constants of neodymium acetate complexes at elevated temperatures by laser-induced photoacoustic spectroscopy

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:126702

Wruck, D A; Kadkhodayan, B; Palmer, C E.A.; Silva, R J ^[1]

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1. Lawrence Livremore Lab., CA (United States)

Chemical thermodynamic data on the formation of solution complexes by radionuclides as a function of temperature are needed for performance assessment studies of proposed radioactive waste repositories. Optical absorption spectroscopy is a preferred method for the measurement of complexation constants in aqueous solutions. Because many of radionuclides of interest, e.g., actinides, must be studied at very low solution concentrations, a system of high sensitivity is required. Therefore, a photoacoustic spectrometer has been developed for high sensitivity optical absorption measurements of aqueous solutions at elevated temperatures. The light source is a Nd: YAG-pumped dye laser system. The photoacoustic signal generated in the sample solution is detected with a piezoelectric transducer coupled to the thermostatted sample cell. The spectrometer has been tested by applying it to the determination of the formation constants of Nd(III) acetate complexes. The formation constants are reported for the temperature range 20 to 70{degrees}C; and are compared to measurements by spectrophotometry and calorimetry.

• OSTI ID: 126702
• Report Number(s): CONF-950402--
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
ABSORPTION SPECTROSCOPY
ACTINIDES
AQUEOUS SOLUTIONS
CALORIMETRY
DYE LASERS
FORMATION HEAT
HIGH-LEVEL RADIOACTIVE WASTES
NEODYMIUM COMPLEXES
PHOTOACOUSTIC SPECTROSCOPY
SENSITIVITY
SPECTROPHOTOMETRY
TEMPERATURE DEPENDENCE
THERMODYNAMIC ACTIVITY
UNDERGROUND DISPOSAL