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本文利用Fe~(3+)离子催化H_2O_2氧化四甲基对苯二胺的反应,将采用停流技术获得的动力学曲线转换成一阶导数曲线,根据导数峰高值与Fe~(3+)离子浓度的线性关系测定药物和自来水中的铁含量。本方法的线性范围为4.0～4.0ngFe~(3+)/ml,相对标准偏差小于2.5％,标准加入回收率在98.7％～101％之间,检测限为1.92ngFe~(3+)/ml。对照实验结果表明,导数动力学法比一般非导数动力学法具有线性关系好、线性范围宽、检测限低,抗干扰能力强和测定时间短等优点。
In this paper, the catalytic kinetics of H_2O_2 oxidation of tetramethyl-p-phenylenediamine (H_2O_2) catalyzed by Fe ~ (3+) ions was converted into the first derivative curve. According to the relationship between the derivative peak height and Fe ~ (3+) The linear relationship between ion concentrations determines the iron content of the drug and tap water. The linear range of this method was 4.0-4.0 ng Fe ~ (3 +) / ml, the relative standard deviation was less than 2.5%, and the standard addition recoveries were between 98.7% and 101% with the detection limits of 1.92 ng Fe ~ (3 +) / ml . The experimental results show that the derivative kinetic method has the advantages of good linearity, wide linear range, low detection limit, strong anti-interference ability and short determination time compared with the general non-derivative kinetic method.