Study of Complexes of Tannic Acid with Fe(III) and Fe(II)

被引：65

作者：

Fu, Zhaofeng ^{[1
]}

Chen, Rui ^{[1
]}

机构：

[1] Yunnan Normal Univ, Coll Chem & Chem Engn, Kunming 650500, Yunnan, Peoples R China

来源：

JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY | 2019年 / 2019卷

基金：

中国国家自然科学基金;

关键词：

POLYPHENOL; WHEAT; AL3+;

D O I：

10.1155/2019/3894571

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

UV-Vis absorption spectra of tannic acid were gained at pH 1.0 approximate to 9.0. Due to the pH value dependence of complex, the stoichiometry of tannic acid with iron ions was tested in buffer solution by the mole ratio method. The result suggests that the complex ratio of tannic acid to Fe(III) is 1:1 and to Fe(II) 3:1 in the carbonate buffer solution, and the complex ratio of iron-tannic complexes is 1:1 at pH 2.2. Due to the different color changes of tannic acid with iron ions in the coordination reactions, a tannic acid test paper was designed. The concentrations of Fe(III) more than 5.000x10(-6)mol/L and the concentrations of Fe(II) more than 1.000x10(-5)mol/L in aqueous solution can be detected by this test paper.

引用

页数：6

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