摘要
钴 (Ⅱ )在NH3·H2O -NH2OH·HCl-5_(5_硝基_2_吡啶偶氮)_2,4_二氨基甲苯体系中有一灵敏的极谱波 ,其峰电位Vp 为 -1.20V(vsSCE) ,钴质量浓度在0.25～25μg/L范围内与峰电流Ip′有良好的线性关系 ,检出限为0.12μg/L;经多种电化学方法证明该波为络合物吸附波 ,其电极过程为不可逆过程 ,电子转移数为2 ,此外还试验了多种离子对峰电流Ip′的影响;所拟方法已用于维生素B12
In NH3·H2O-NH2OH·HCl-5 _ (5 _ nitro _ 2 _ pyridylazo) _ 2,4 _ diaminotoluene system cobalt(Ⅱ) causes a sensitive polarographic wave at the potential of -1.2 V(vs SCE). The first _ order derivative peak current of the wave is linearly proportional to cobalt mass concentration in the range of 0.25～25 μg/L for cobalt(Ⅱ)(r=0.998 8) with a detection limit of 0.12 μg/L. Several electrochemical methods were used to study the properties of the wave. It proved to be an adsorptive wave of the complex of cobalt . The electrode process is an irreversible redox process, and the number of electron transfer is 2. The effects of many ions on the peak current were tested. The proposed method was used to determine trace cobalt in vitamin B12 and artificial samples.
出处
《分析测试学报》
CAS
CSCD
北大核心
2003年第1期48-51,共4页
Journal of Instrumental Analysis
基金
陕西省教育厅专项科研计划项目 (00JK132)
