氨基硅油修饰碳糊电极阳极伏安法测定叶酸  

Anodic Voltammetric Determination of Folic Acid Using Carbon Paste Electrode Modified with Amino-silicon Oil

作　　者：顾玲[1] 李素敏[1] 彭莉[1] 张建华[1] 

机构地区：[1]教育部轻化工助剂化学与技术重点实验室陕西科技大学,西安710021

出　　处：《理化检验（化学分册）》2010年第5期503-505,508,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在pH 6.8的B-R缓冲溶液中,采用氨基硅油修饰碳糊电极做工作电极,线性扫描伏安法对叶酸进行测定。伏安图上出现一灵敏的氧化峰,其峰电位EPa=＋0.84 V,峰电流与叶酸的浓度在1.6×10-7-6.5×10-6mol.L-1范围内呈线性关系,检出限（3S/N）为7.2×10-8mol.L-1。富集时间为100 s,同时采用循环伏安法研究叶酸在氨基硅油修饰碳糊电极上的氧化还原反应,结果表明此电极反应为一不可逆的吸附过程。Folic acid was determined by linear sweeping voltammetry in a B-R buffer solution of pH 6.8,using the amino-silicon oil modified carbon paste electrode as working electrode.A sensitive oxidation peak of folic acid was obserbed in the voltammogram at the peak potential（Epa） of ＋0.84 V（vs.SCE）.Linear relationship between values of peak current and concentration of folic acid was kept in the range of 1.6×10-7-6.5×10-6mol·L-1,with value of detection limit（3S/N） 7.2×10-8mol·L-1.The time of accumulation taken for folic acid was 100 s.As shown by the results of cyclic voltammetric study of electrochemical behavior of folic acid,the redox electrode reaction at the aminosilicon oil modified carbon paste electrode was proved to be an irreversible adsorption process.

关 键 词：线性扫描伏安法 化学修饰碳糊电极 叶酸 

分 类 号：O657.14[理学—分析化学]