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本文研究稀锌硅酸溶液中简单锌硅络合物的形成.用浓差电动势法与极谱法测定这些络合物的组成与稳定常数.结果表明:OH~-与硅粒子间存在着对锌的竞争性络合作用.在Zn≤0.02M、OH~-为1～2M与Si为0～0.5M的范围内存在[Zn(OH)_4]~(2-)、[Zn(OH)_3·SiO(OH)_3]~(2-)及[Zn(OH)_2(SiO_2(OH)_2)_2]~(4-)三种锌络离子.在离子强度I=5.0M、30℃时它们的稳定常数相应为3.0×10~(15)、1.2×10~(16)与6.2×10~(16).
In this paper, the formation of simple zinc-silicon complexes in dilute zinc silicate solution was investigated.The composition and stability constants of these complexes were determined by potentiodynamic electromotive force method and polarographic method.The results showed that there was (Zn (OH) 4] ~ (2 -), [Zn (OH) 2] and Zn in the range of Zn≤0.02M, OH ~ _3 · SiO (OH) _3] ~ (2-) and [Zn (OH) _2 (SiO_2 (OH) _2) _2] Their stable constants are 3.0 × 10 ~ (15), 1.2 × 10 ~ (16) and 6.2 × 10 ~ (16) respectively.