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Abstract

Equilibria in the U(VI)-H(2)O-CO(2)(g) system in 0.5M sodium perchlorate medium at 25 C are studied. By using thermal lensing spectrophotometry (TLS) and a very low total concentration of U(VI) (4 x 1.0 E-6M), information is obtained on equilibria involving UO(2)[CO(3)](2)(2-) without complications due to formation of the trimer [UO(2)](3)[CO(3)](6)(6-). The experimental data give a precise determination of the equilibrium constant log K(3) = 6.35 +/- 0.05 for the reversible reaction between {UO(2)[CO(3)](2)(2-) + CO(3)(2-)} and {UO(2)[CO(3)](3)(4-)}. The interpretation of TLS data is briefly discussed, as well as the potential use of this technique for studies of the speciation of trace elements in natural water systems.

Additional information

Authors: BIDOGLIO G, JRC Ispra (IT);CAVALLI P, JRC Ispra (IT);OMENETTO N, JRC Ispra (IT);TANET G, JRC Ispra (IT);GRENTHE I, Royal Institute of Technology, Department of Inorganic Chemistry, Stockholm (SE);QI P, Chinese Academy of Sciences, Institute of Mechanics, Beijing (CN)
Bibliographic Reference: Article: Talanta, Vol. 38 (1991) No. 4, pp. 433-437
Record Number: 199110900 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en