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《Chemical Analysis and Meterage》 2012-01
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Prearation of Pencil Lead Microelectrode and its Applycation in the Determination of Ascorbic Acid by Electrochemical Method

He Fengyun,Wu Lijian,Yang Lijun,Shao Xiudan,Liu Huan(School of Biochemical and Environmental Engineering,Nanjing Xiaozhuang University,Nanjing 211171,China)  
Pencil lead microelectrode was prepared and then it was applied to the determination of ascorbic acid(AA).The results showed that ascorbic acid concentration was linear with oxidation peak current in the range of 5.0×10–5–1.0×10–2?mol/L under the optimum condition,r2=0.999?3.The detection limit was 2.5×10–5?mol/L(S/N=3).The relative standard deviation was 4.7% for six times parallel determination of 2.5×10–3 mol/L ascorbic acid.The pencil lead microelectrode can be applied to the analysis of ascorbic acid with recovery of 94.8%–99.8%.
【Fund】: 江苏省大学生创新训练计划项目(2160081);; 南京晓庄学院科研项目(2010KYYB19)
【CateGory Index】: O657.15
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