通过Fe3+的水解平衡,对聚铁溶液中各种羟基配离子的分布进行了讨论,指出了多核配离子的形成与溶液的铁浓度和pH值有关;在铁完全水解形成长链多核聚合物时,其n(OH)∶n(Fe)可达到2;通过计算说明实际盐基度与测定结果之间差异产生的主要原因在于在pH值较低时,硫酸根的主要存在形式是HSO4-而不是SO42-。

The distribution of different hydroxy coordination ions by means of hydrolytic equilibrium of Fe³⁺. It ispointed out that the formation of the multinuclear coordination ions is related to the ferric concentration and pHvalue of the solution. When Fe³⁺ is fully hydrolyzed and forms long chain multinuclear polymer，its ratio ofn(OH)/n(Fe) can be up to 2. Through calculation，it shows the main reason causing the difference between theactual basicity and the determination result is due tovthe main form of sulfate ion is HSO₄^- instead of SO₄^2-，whenthe pH value of solution is lower.