摘要
本文研究了铁（Ⅱ）－硫代巴比妥酸－ＮＯ－２体系显色反应的适宜条件及配合物的存在形式和光度特性，并对体系的显色机理进行了探讨，建立了一种测定微量铁的新分光光度法。
In this paper,the optimum conditions of colour reaction of iron(Ⅱ) thibarbituric acid NO - 2 system,existent state and spectrophotometric characteristies of the complex were studied,and the reaction mechanism discussed.A new spectrophotometric method for the determination of trace iron was established.In a buffer solution of borate/NaOH of pH9 5,iron(Ⅱ) and thibarbituric acid NO 2 react to form a stable blue complex anion,for which the maximum absorbance is at 645nm and the molar absorptivity is 2 66×10 4L·mol -1 ·cm -1 .Beer′s law is obeyed in the range of 0～40μg/25mL for iron(Ⅱ).The method is simple and rapid,shows satisfactory selectivity and precision and has been applied to determine iron in waters with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1998年第6期759-761,共3页
Spectroscopy and Spectral Analysis
关键词
硫代巴比妥酸
显色反应
铁
测定
光度法
Thibarbituric acid, Colour reaction, Iron determination
