摘要
抗坏血酸(AH_2)在玻碳和铂电极上的过电位较大,其电极反应不可逆.有关AH_2在碳及其它修饰电极上的电催化氧化已有一些报道,如减压热处理、Al_2O_3微粒研磨、普鲁士蓝修饰膜和聚乙烯二茂铁修饰膜等.本文研究了铁氰化镍修饰膜电极催化AH_2氧化的电化学行为.发现其阳极峰电流与AH_2浓度呈线性关系,可测定1×10^(-7)mol/L的AH_2,其灵敏度比聚乙烯二茂铁修饰电极提高一个数量级.用于蔬菜、水果中AH_2的测定,结果满意.
The nickel hexacyanoferrate (NiHCF) film modified electrode was made by electrochemically depositing method. The electrocatalytic oxidation of ascorbic acid (AH2) on the electrode was described. The oxidation peak potential shifts negatively 300 mV. The modified electrode can be used for determination of ascorbic acid in the concentration range of 1. 0× 10-7 -1. 0×10-2 mol/L. This method has been applied successfully to the analysis of ascorbic acid in fruits and vegetables.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期325-327,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
铁氰化镍
修饰电极
维生素C
Nickel hexacyanoferrate, Chemically modified electrode, Ascorbic acid
