Solution microcalorimeter for measuring heats of solution of radioactive elements and compounds
Technical Report
·
OSTI ID:6446137
The microcalorimeter vessel is constructed of tantalum metal, with a nominal volume of 5 cm/sup 3/. Its energy equivalent is 24 J K/sup -1/ when containing 5 cm/sup 3/ H/sub 2/O. The thermal leakage modulus is 0.010 min/sup -1/. A thermistor is employed as the temperature sensor. The operating sensitivity is about 1 x 10/sup -5/ K (300 ..mu..J). The performance of the calorimetry system was tested using tris(hydroxymethyl)aminomethane (TRIS) and magnesium metal. The results of the TRIS experiments, at a concentration of 1 g dm/sup -3/ in 0.1 N HCl at 298 K, yielded a heat of solution of -29.606 +- 0.063 kJ mol/sup -1/. The magnesium experiments, in 1 N HCl at 298 K, gave a heat of solution of -465.965 +- 1.136 kJ mol/sup -1/. The heat of solution of curium-248 metal in 1 N HCl at 298 K was measured. The experiments, which should not be considered definitive, yielded a heat of solution of -606.4 +- 1.8 kJ mol/sup -1/. A single measurement in 6 N HCl gave a heat of solution of -602.3 kJ mol/sup -1/. From these results the heat of formation of Cm/sup 3 +/ /sub (aq)/ is calculated to be -607.2 +- 2.5 kJ mol/sup -1/.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- OSTI ID:
- 6446137
- Report Number(s):
- ORO-4447-081
- Country of Publication:
- United States
- Language:
- English
Similar Records
Acid association quotients of tris(hydroxymethyl)aminomethane in aqueous NaCl media to 200/sup 0/C
An Ultrasensitive Thermistor Microcalorimeter and Heats of Solution of Neptunium, Uranium and Uranium Tetrachloride
AN ULTRASENSTITIVE MICROCALORIMETER AND THE HEATS OF FORMATION OF U$sup +4$(aq) AND UOH$sup +3$(aq) (thesis)
Journal Article
·
Wed Jul 01 00:00:00 EDT 1987
· J. Solution Chem.; (United States)
·
OSTI ID:6977699
An Ultrasensitive Thermistor Microcalorimeter and Heats of Solution of Neptunium, Uranium and Uranium Tetrachloride
Journal Article
·
Tue Oct 31 23:00:00 EST 1961
· Journal of Physical Chemistry
·
OSTI ID:4817380
AN ULTRASENSTITIVE MICROCALORIMETER AND THE HEATS OF FORMATION OF U$sup +4$(aq) AND UOH$sup +3$(aq) (thesis)
Technical Report
·
Fri Jul 01 00:00:00 EDT 1960
·
OSTI ID:4066990
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALORIMETERS
CURIUM 248
CURIUM COMPOUNDS
CURIUM ISOTOPES
ENTHALPY
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
MEASURING METHODS
NUCLEI
PERFORMANCE TESTING
PHYSICAL PROPERTIES
RADIOACTIVE MATERIALS
RADIOISOTOPES
SOLUTION HEAT
TESTING
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES
400201* -- Chemical & Physicochemical Properties
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALORIMETERS
CURIUM 248
CURIUM COMPOUNDS
CURIUM ISOTOPES
ENTHALPY
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
MEASURING METHODS
NUCLEI
PERFORMANCE TESTING
PHYSICAL PROPERTIES
RADIOACTIVE MATERIALS
RADIOISOTOPES
SOLUTION HEAT
TESTING
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES