The effects of temperature and PO₄ substitutions on the solubility of a series of vanadinite (Van) Pb₅(VO₄)₃Cl–pyromorphite (Py) Pb₅(PO₄)₃Cl solid solutions were experimentally investigated to determine differences in dissolution mechanisms and to estimate the K_sp and thermodynamic state functions ΔH°_f, ΔG°_f, S°, and ΔC°_p. Dissolution of Van and the selected phases from the Van–Py series at pH 2.0 was congruent at 5 °C, but it became noncongruent with precipitation of a secondary phase - chervetite Pb₂V₂O₇ in the temperature range of 25–65 °C. The isomorphic substitution of VO₄ with PO₄ reduced the level of Pb released during dissolution into the equilibrium solution from approximately 207.2 mg Pb L⁻¹ for Van to 131 mg Pb L⁻¹ for Py (at 5 °C). This substitution, however, simultaneously caused a very strong increase in the thermodynamic solubility constant K_sp, which showed a large difference (over 14 orders of magnitude) for the end members of the series. The experimentally determined K_sp at 5 °C varied from 10^{−96.89±0.53} for Van to 10^{−80.91±0.70} for Py. The variation in K_sp was linear with substitution of VO₄ with PO₄ and curvilinear with change in temperature. The more the amount of vanadium in the structure, the stronger was the temperature effect. Because of the noncongruent dissolution followed by far from equilibrium state for V-reach samples at higher temperatures, the experimental determination of thermodynamic state functions was possible only for pyromorphite and some P-reach members of Py–Van solid solution series. For Py, ΔH°_f = −4098 ± 5 (kJ mol⁻¹), ΔG°_f = −3763 ± 4 (kJ mol⁻¹), S° = 667 ± 313.4 (kJ mol⁻¹ K⁻¹), and ΔC°_p = −930.9 ± 345.2 (kJ mol⁻¹ K⁻¹). For Van, ΔH°_f = −3796 ± 10 (kJ mol⁻¹), ΔG°_f = −3486 ± 4 (kJ mol⁻¹), S° = 719 ± 694 (kJ mol⁻¹ K⁻¹), and ΔC°_p = −1037 ± 605 (kJ mol⁻¹ K⁻¹) were estimated.

通过实验研究了温度和 PO ₄取代对一系列钒铅矿 (Van) Pb ₅ (VO ₄ ) ₃ Cl-焦铁矿 (Py) Pb ₅ (PO ₄ ) ₃ Cl 固溶体溶解度的影响，以确定溶解度的差异机制并估计 K _sp和热力学状态函数 ΔH° _f、ΔG° _f、S° 和 ΔC° _p。Van 和从 Van-Py 系列中选择的相在 pH 2.0 时的溶解在 5 °C 下是一致的，但随着第二相的沉淀而变得不一致 - 钙钛矿 Pb ₂ V ₂O ₇在 25–65 °C 的温度范围内。VO ₄与PO ₄的同构取代降低了溶解到平衡溶液期间释放的Pb 水平，从Van 的大约207.2 mg Pb L ^-1到Py 的131 mg Pb L ^-1（在5°C 下）。然而，这种替代同时导致热力学溶解常数 K _sp的非常强烈的增加，这表明该系列的末端成员存在很大差异（超过 14 个数量级）。实验确定的 K _sp在 5°C 从Van 的10 ^-96.89±0.53变化到Py 的10 ^-80.91±0.70。K _sp的变化PO ₄取代VO ₄呈线性，随温度变化呈曲线。结构中钒的量越多，温度效应越强。由于 V-reach 样品在较高温度下发生非一致溶解后远离平衡状态，因此热力学状态函数的实验确定仅适用于焦吗啉和 Py-Van 固溶体系列的一些 P-reach 成员。对于 Py，ΔH° _f  = -4098 ± 5 (kJ mol ^-1 )，ΔG° _f  = -3763 ± 4 (kJ mol ^-1 )，S° = 667 ± 313.4 (kJ mol ^-1 K ^-1 )，和ΔC° _p  = -930.9 ± 345.2 (kJ mol ^-1K ^-1 )。对于 Van，ΔH° _f  = -3796 ± 10 (kJ mol ^-1 )，ΔG° _f  = -3486 ± 4 (kJ mol ^-1 )，S° = 719 ± 694 (kJ mol ^-1 K ^-1 )，和ΔC° _p  = -1037 ± 605 (kJ mol ^-1 K ^-1 ) 被估计。