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实验研究了糊精(或糊精水解物)-柠檬酸-Fe(Ⅲ)三元配合物的合成条件及某些化学性能。证明Fe(Ⅲ)与糊精水解产物的配合能力较糊精为强。红外光谱显示Fe(Ⅲ)与糊精和糊精水解产物所形成的配合物具有相同的配位结构。水溶液都不显示游离Fe(Ⅲ)离子的特效反应,在pH值达11时均未出现沉淀,说明该类化合物比较稳定。还原动力学实验证明该类配合物中Fe(Ⅲ)易被还原。
The synthesis conditions and some chemical properties of dextrin (or dextrin hydrolyzate) -citric acid-Fe (Ⅲ) ternary complex were experimentally studied. Proof Fe (Ⅲ) and dextrin hydrolysates with stronger than dextrin. Infrared spectroscopy showed that Fe (Ⅲ) has the same coordination structure with the complex formed by dextrin and dextrin hydrolysates. The aqueous solution did not show the specific reaction of free Fe (Ⅲ) ions. No precipitate appeared at pH of 11, which indicated that the compounds were stable. Reduction kinetics experiments show that Fe (Ⅲ) in these complexes is easily reduced.