STUDIES ON METAL CARBONATE EQUILIBRIA .21. STUDY OF THE U(VI)-H2O-CO2(G) SYSTEM BY THERMAL LENSING SPECTROPHOTOMETRY

被引：8

作者：

BIDOGLIO, G ^{[1
]}

CAVALLI, P ^{[1
]}

GRENTHE, I ^{[1
]}

OMENETTO, N ^{[1
]}

PAN, Q ^{[1
]}

TANET, G ^{[1
]}

机构：

[1] ISPRA ESTAB, COMM EUROPEAN COMMUNITIES JOINT RES CTR, I-21020 ISPRA, ITALY

来源：

TALANTA | 1991年 / 38卷 / 04期

关键词：

D O I：

10.1016/0039-9140(91)80082-B

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Equilibria in the U(VI)-H2O-CO2(g) system in 0.5M sodium perchlorate medium at 25-degrees have been studied. By using thermal lensing spectrophotometry (TLS) and a very low total concentration of U(VI) (4 x 10(-6)M) information could be obtained on equilibria involving UO2(CO3)2(2-) without complications due to formation of the trimer (UO2)3(CO3)6(6-). The experimental data allowed a precise determination of the equilibrium constant log K3 = 6.35 +/- 0.05 for the reaction UO2(CO3)2(2-) + CO3(2-) half-arrow-right-over-half-arrow-left UO2(CO3)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.

引用

页码：433 / 437

页数：5

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