Solid-phase spectrophotometric microdetermination of iron with ascorbic acid and ferrozine

被引：20

作者：

Fernández-de Córdova M.L. ^{[1
]}

Ruíz-Medina A. ^{[1
]}

Molina-Díaz A. ^{[1
]}

机构：

[1] Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén

来源：

Fresenius' Journal of Analytical Chemistry | 1997年 / 357卷 / 1期

关键词：

Iron; Waste Water; Detection Limit; Ascorbic Acid; Sample Volume;

D O I：

10.1007/s002160050108

中图分类号：

学科分类号：

摘要：

A very sensitive and selective method for the determination of trace amounts of iron has been developed, based on the reduction of Fe(III) to Fe(II) by ascorbic acid, followed by chromogenic chelation of Fe(II) with ferrozine. The complex Fe(II)-ferrozine is easily sorbed on a dextran-type anion-exchange gel packed in a 1 mm cell, and the absorbance of the gel is measured directly at 569 and 800 nm. The extended linear range of the determination is 0.5-10 ng ml-1 of iron (apparent molar absorptivity = 4.4 × 107 l mol-1 cm-1) and the precision (RSD) 1.3% for a concentration of 5 ng ml-1 of iron (n = 10). The detection limit for a sample volume of 1000 ml, using 0.040 g of anion-exchanger, corresponds to 0.12 ng ml-1. The method has been successfully applied to the determination of iron in natural and waste waters, wine, soil extract and previously digested vegetal tissues, drugs and human hair. © Springer-Verlag 1997.

引用

页码：44 / 49

页数：5

共 18 条

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