Solubility of triuranyl diphosphate tetrahydrate (TDT) and Na autunite at 23 and 50°C

被引：2

作者：

Armstrong, C. R. ^{[1
]}

Felmy, A. R. ^{[2
]}

Clark, S. B. ^{[1
]}

机构：

[1] Washington State Univ, Pullman, WA 99164 USA

[2] Pacific NW Natl Lab, Richland, WA 99354 USA

来源：

RADIOCHIMICA ACTA | 2010年 / 98卷 / 9-11期

基金：

美国国家科学基金会;

关键词：

Autunite; U(VI) phosphate minerals; Actinide contaminant remediation; MINERAL EQUILIBRIA; NATURAL-WATERS; PHOSPHATE; PREDICTION;

D O I：

10.1524/ract.2010.1752

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

In this report we present experimental solubility data for well-characterized triuranyl diphosphate tetrahydrate (TDT: (UO2)(3)(PO4)(2)center dot 4H(2)O) and Na autunite (Na[UO2PO4]center dot xH(2)O) at 23 and 50 degrees C in NaClO4-HClO4 solutions at pC(H+) = 2. Duplicate samples of TDT in 0.1, 0.5, 1.0, 2.0 and 5.0 in solutions were equilibrated at 23 and 50 degrees C. TDT solid was synthesized and characterized with ICP-OES, ATR-IR and powder XRD before and after solubility experiments. The pH of the suspensions were monitored throughout the experiments. Equilibrium was achieved from undersaturation with respect to TDT and oversaturation for Na autunite. Steady-state conditions were achieved in all cases within 82 d. TDT was unstable at ionic strengths above 0.1 m, where its complete conversion to Na autunite was observed. The ion-interaction model was used to interpret the experimental solubility data. The solubility product, log K-sp, for TDT was determined to be -49.7 and -51.3 at 23 and 50 degrees C respectively. log K for Na autunite was determined to be -24.4 (23 degrees C) and -24.1 +/- 0.2 (50 degrees C).

引用

页码：549 / 554

页数：6

共 21 条

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