Abstract Clay minerals (kaolinite KGa-2, smectite MX-80, illite IMt-2, vermiculite SO and Chlorite Cca-2) were equilibrated in aqueous media during long-term batch experiments up to seven years. Dissolved element concentrations were measured, allowing calculation of the ionic activity product of the minerals. An improved protocol for equilibration has been established to limit evaporation over the seven years of the experiments and to optimize the analytical results accuracy. The protocol could be verified with respect to the solubility of kaolinite. For the other minerals, the equilibrium constants obtained could be compared with the values calculated after calorimetric measurements previously performed on the same samples. The ionic activity products extracted for illite, smectite and, to a lesser extent, vermiculite were found to agree with the values issued from the calorimetric measurements. For chlorite in particular, a discrepancy with calorimetric measurements still remains. This was interpreted in terms of dissolution rates getting slower for this mineral, formed at temperatures higher than 25 °C.

中文翻译：

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来自水平衡的粘土矿物溶解度：测量热力学性质的评估

摘要 粘土矿物（高岭石 KGa-2、蒙脱石 MX-80、伊利石 IMt-2、蛭石 SO 和绿泥石 Cca-2）在长达 7 年的长期批量实验中在水性介质中平衡。测量溶解元素浓度，从而计算矿物质的离子活性乘积。已经建立了一种改进的平衡方案，以限制七年实验中的蒸发并优化分析结果的准确性。该协议可以在高岭石的溶解度方面得到验证。对于其他矿物，获得的平衡常数可以与先前对相同样品进行量热测量后计算的值进行比较。为伊利石、蒙脱石和在较小程度上提取的离子活性产物，发现蛭石与从量热测量得出的值一致。特别是对于绿泥石，与量热测量的差异仍然存在。这被解释为这种矿物在高于 25 °C 的温度下形成的溶解速度变慢。