Thermodynamic model for the solubility of NdPO4(c) in the aqueous Na+-H+-H2PO4–HPO42–OH–Cl–H2O system

被引：0
作者：
D. Rai
A. R. Felmy
M. Yui
机构：
[1] Pacific Northwest National Laboratory,
[2] Japan Nuclear Cycle Development Institute Tokai Works,undefined
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2003年 / 256卷
关键词：
PO43; Experimental Data; Physical Chemistry; Inorganic Chemistry; Equilibrium Constant;
D O I：
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摘要：
The solubility of NdPO4(c) was studied at 23±2 °C from both the over and undersaturation directions, with pH ranging from 0 to 9, P concentrations ranging from 0.0003 to 1.00M, and equilibration periods ranging from 6 to 57 days. Equilibrium was reached in <6 days. From the H+, Nd, and P concentrations in equilibrated solutions, the logarithm of the thermodynamic equilibrium constant for the reaction (NdPO4(c) ⇄ Nd3++PO43-) was calculated to be -24.65±0.23 and the value of the Pitzer ion-interaction parameter β(2)for Nd3+-H2PO4- was determined to be -92.9. Predictions based on these thermodynamic quantities were in excellent agreement with the experimental data.
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页码：37 / 43
页数：6
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