The vapor–liquid partitioning of Si(OH)₄, B(OH)₃, Ge(OH)₄, As(OH)₃ and Sb(OH)₃ in water at temperatures between 567.7 and 633.2 K was studied by sampling the coexisting vapor and liquid phases. For Ge(OH)₄ and Sb(OH)₃ the measurements in pure water have been made for the first time. Distribution constants for all hydroxides of metalloids, $K_{\text{D}}$, are smaller than unity, i.e., these compounds strongly partition into the liquid phase. Correspondingly, the values of the Krichevskii parameter, $A_{\mathrm{K}\mathrm{r}}$, the property that governs the thermodynamic properties of a solute close to the critical point of a solvent, for all these species are negative and equal (in MPa) to −178.6 ± 3.6 for Si(OH)₄, −172.4 ± 5.5 for Ge(OH)₄, −77.8 ± 1.3 for B(OH)₃, −112.6 ± 4.6 for As(OH)₃, and −160 ± 12 for Sb(OH)₃, correspondingly. For indicated species the recommended values of $K_{\text{D}}$ are tabulated at T ≥ 523.15 K.

Si(OH) ₄、B(OH) ₃、Ge(OH) ₄、As(OH) ₃和 Sb(OH) ₃在 567.7 到 633.2 K 之间的温度下在水中的汽液分配通过对共存的气相和液相。对于 Ge(OH) ₄和 Sb(OH) ₃，首次在纯水中进行了测量。所有准金属氢氧化物的分布常数，${钾}_{\text{D}}$, 小于 1，即这些化合物强烈分配到液相中。相应地，Krichevskii 参数的值，${\mathrm{一种}}_{\mathrm{钾}\mathrm{r}}$，控制接近溶剂临界点的溶质的热力学性质的性质，因为所有这些物质都是负的并且等于（以 MPa 为单位）Si(OH) ₄为 -178.6 ± 3.6 ，Ge 为 -172.4 ± 5.5 (OH) ₄，B(OH) ₃为-77.8 ± 1.3，As(OH) ₃为-112.6 ± 4.6 ，Sb(OH) ₃为-160 ± 12 ，相应地。对于指定物种，推荐值${钾}_{\text{D}}$列在T  ≥ 523.15 K 时。