Experimental and modeling study of the aqueous solubility of vanadium(V) incorporated by solid solution in apatite phases

为了了解火山区含水层中钒的浓度升高，以及钒对人体骨骼系统的毒性效应，我们将研究磷酸盐和钒磷灰石之间的固溶体的溶度积。羟基磷灰石和氟磷灰石系列都将被研究。在碱性介质中，将在一步水相法的基础上合成磷酸盐/钒酸盐混合磷灰石。钒酸盐取代磷酸盐的结构分析将在同步加速器设施中使用X射线衍射仪和EXAFS分析进行。数据的理论解释将基于Lippmann方程和Gibbs能量最小化程序GEMS对二元磷酸盐-钒磷灰石系列的固溶水溶液平衡方法进行。这项工作的目的是预测在磷灰石主体相中加入的任何钒组分的钒的溶解度。

To understand the elevated vanadium concentrations in aquifers of volcanic areas, and also the toxic effects of vanadium on the human skeletal system, the solubility products of the solid solutions between phosphate and vanadate apatite phases will be investigated. Both hydroxyapatite and fluorapatite series will be investigated. The synthesis of the mixed phosphate/vanadate apatites will be performed on the basis of a one-step aqueous method in alkaline media. Structural analysis of the phosphate substitution by vanadate will be performed using XRD and EXAFS analysis at a synchrotron facility. A theoretical interpretation of the data will be performed based on the solid-solution aqueous-solution equilibrium approach for the binary phosphate-vanadate apatite series using Lippmann equations, and also by using the Gibbs energy minimization code GEMS. The aim of this effort is to predict the vanadium solubility at any vanadium fraction incorporated in the apatite host phase.