循环伏安法测定氯化铵镀镉溶液中镉离子浓度

Determination of cadmium ion in ammonium chloride cadmium plating solution by cyclic voltammetry method

以玻碳电极作为工作电极,采用三电极体系建立了循环伏安法测定氯化铵镀镉溶液中Cd^(2+)浓度的电化学分析方法。系统分析了电位扫描范围、测定体系pH和扫描速率对于氯化铵镀镉液中Cd^(2+)浓度测试的影响,并予以优化。在优化后的测试条件下建立Cd^(2+)浓度与氧化峰电流之间的关系曲线为I_(p)=0.164x-2.238(R^(2)=0.995)。结果表明,循环伏安方法的相对标准偏差RSD小于1%,加标回收率在98%~110%之间,对共存组分的干扰研究表明,Fe^(3+)、Co^(2+)和Cu^(2+)对于Cd^(2+)测试结果的影响较小。

An electrochemical analytical method was developed for the rapid detection of Cd^(2+)concentration in ammonium chloride-based cadmium plating solutions.A glassy carbon electrode was used as the working electrode within a three-electrode system,and the measurement was carried out by cyclic voltammetry.The impact of key experimental parameters,such as scanning potential range,pH and scan rate,on the measurement was investigated to optimize the procedure.Under optimal conditions,a linear relationship between the oxidation peak current(Ip)and CdCl_(2) concentration was established,with a standard curve equation of I_(p)=0.164x-2.238(R^(2)=0.995).The results showed that the method demonstrated high precision with relative standard deviations(RSDs)below 1% and good accuracy with recoveries ranging from 98% to 110% as assessed by the standard addition method.Interference studies revealed that common coexisting ions such as Fe^(3+),Co^(2+)and Cu^(2+)had minimal effects on the determination of Cd^(2+).