含有少量磷酸根的三价铁盐的水解机理是相当复杂的，这个过程可分为两个阶段，即：成核前的水解机理和成核后的水解机理．本文应用Ferron逐时络合比色法研究了前一个阶段的水解机理．此法把三价铁水解过程中的形态区，分为Fe(a)、Fe(b)和Fe(c)三类，它们分别代表了三价铁盐水解产生的不同聚合度的聚合物．并根据三价铁回收曲线的形状间接确定了磷酸根的位置，阐明了为什么磷酸根的存在会对三价铁盐溶液的水解产生抑制作用，该结果对均匀纺锤形α-Fe2 O3粒子的制备具有一定的指导意义．
The hydrolysis mechanism of Fe(III) solution is rather complicated when small amounts of phosphate ions are present. The process may be divided into two stage, namely, before and after precipitation. The former was studied by Ferron-complex ion timed spectrophotometric method in this paper. The method was used to classify the aqueous species of Fe(III) into three categories, i.e., Fe(a), Fe(b) and Fe(c), which represent their different exents of hydrolysis and polymerization, respectively. The site of phosphate was indirectly defined by the shape of Fe(III)recovery curve. The reason why the presence of phosphate can restrain the hydyolysis of Fe(III)solution is expounded. The result obtained has a specific signifitance for guiding the synthesis of uniform and ellipsoidal hematite(α-Fe2 O3) particles.
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