Analytical application of the reaction system disulphonated hydroquinone-hydrogen peroxide for the kinetic spectrophotometric determination of iron traces in acidic media

Chemical Industry Pub Date : 2019-12-29 DOI:10.2298/hemind190704032t

S. Tošić, S. Mitić, A. Pavlović, Emilija T. Pecev-Marinković, D. Kostić, S. Rančić

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Abstract

A simple, rapid, sensitive and selective kinetic spectrophotometric method for determination of Fe(III) traces was elaborated in this paper. It is based on the catalytic effect of Fe(III) ions on oxidation of potassium salt of disulphonated hydroquinone (K2S2Hy) by hydrogen peroxide in acidic media, at a constant ionic strength. At the working temperature of 20?C and the wavelength of 450.0 nm, optimal conditions for determination of iron were found so that iron (III) can be determined by the proposed method in the concentration range of 1.87 to 18.7 ng cm-3. Corresponding RSD values were determined to be in the range 4.22 to 10.33 %. The limit of detection (LOD) calculated in two ways was found to be 1.07 ng cm-3 i.e. 1.11 ng cm-3 Fe(III). In order to assess the selectivity of the method effects of different ions on the reaction rate were also determined. It was found that presence of oxalates and citrates in the w/w ratio to Fe(III) 1:1 under selected experimental conditions interferes with determination of iron. Then the method was applied for determination of Fe(III) traces in white radish juice. The results agreed well with those obtained by atomic absorption spectrometry.

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二磺化对苯二酚-过氧化氢反应体系动力学光度法测定酸性介质中铁的分析应用

本文介绍了一种简便、快速、灵敏、选择性的动力学分光光度法测定痕量铁(III)的方法。它是基于铁(III)离子在一定离子强度下在酸性介质中对过氧化氢氧化二磺化对苯二酚(K2S2Hy)钾盐的催化作用。工作温度为20?在波长为450.0 nm时，找到了测定铁的最佳条件，该方法可在1.87 ~ 18.7 ng cm-3的浓度范围内测定铁(III)。相应的RSD值在4.22 ~ 10.33%之间。两种方法计算的检出限(LOD)为1.07 ng cm-3即1.11 ng cm-3 Fe(III)。为了评价该方法的选择性，还测定了不同离子对反应速率的影响。在选定的实验条件下，草酸盐和柠檬酸盐与Fe(III)的w/w比为1:1，会干扰铁的测定。将该法应用于白萝卜汁中痕量铁的测定。结果与原子吸收光谱法测定结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chemical Industry

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