Use of thermal lensing spectrophotometry (TLS) for the study of mononuclear hydrolysis of uranium(IV)
Journal Article
·
· Inorg. Chem.; (United States)
The possibility of using thermal lensing spectrophotometry (TLS) for the quantitative determination of chemical equilibria in very dilute (/approx/ 10/sup /minus/5/ M) aqueous solution has been explored. The hyrolysis of uranium(IV) has been used as a test case. TLS turned out to be a convenient, precise, and rapid method to obtain information about the mononuclear hydrolysis, information that is difficult to obtain with more traditional solution chemical methods. The TLS data were obtained at 25/degree/C in the concentration range of 0 /le/ /minus/log (H/sup +/) /le/ 2.8 by using a 3 M (Na,H)ClO/sub 4/ ionic medium. The data were described with the following chemical model: U/sup 4+/ + H/sub 2/O /r equilibrium/ UOH/sup 3+/ + H/sup +/, log */beta//sub 1/ = -1.65 /plus minus/ 0.05; U/sup 4+/ + 2H/sub 2/O /r equilibrium/ U(OH)/sub 2//sup 2+/ + 2H/sup +/, log */beta//sub 2/ < -4.5. Apart from its higher sensitivity, the TLS method has the same characteristics as ordinary spectrophotometric methods. The experimental results of this study and previous literature information were interpreted by using the specific ion interaction theory to give log */beta//degree//sub 1/ = -0.51 /plus minus/ 0.03 (log */beta//degree//sub 1/ is the equilibrium constant at zero ionic strength) and /Delta//epsilon/ is the ion interaction term /Delta//epsilon/ = /epsilon/(UOH/sup 3+/, ClO/sub 4//sup /minus//) + /epsilon/(H/sup +/, ClO/sub 4//sup /minus//) /minus/ /epsilon/(U/sup 4+/, ClO/sub 4//sup /minus//). 16 refs., 5 figs..
- Research Organization:
- Joint Research Centre, Ispra (Italy)
- OSTI ID:
- 5852054
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 28:1; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
HYDROLYSIS
INFORMATION
LYSIS
NUMERICAL DATA
SOLVOLYSIS
URANIUM COMPOUNDS
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
HYDROLYSIS
INFORMATION
LYSIS
NUMERICAL DATA
SOLVOLYSIS
URANIUM COMPOUNDS