L-抗坏血酸在磷酸溶液中的单扫描极谱氧化波及其应用  

Single Sweep Polarographic Oxidation Wave of L-Ascorbic Acid in H_3PO_4 Solution and Its Analytical Application

作　　者：朱琳[1] 罗登柏[1] 

机构地区：[1]中南民族大学化学与材料科学学院分析化学国家民委重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2006年第3期1-4,共4页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：湖北省自然科学基金资助项目(2005ABA001);中南民族大学自然科学基金重点资助项目(YZZ03003)

摘　　要：报道了L-抗坏血酸在酸性溶液中的极谱氧化波及其应用．在0．15mol／L H3PO4溶液中，抗坏血酸在单扫描极谱上于＋0．30V（vs．SCE）处产生一灵敏吸附性氧化峰，汞的氧化电流对其没有干扰，其二阶导数波形尖锐对称．波高与1．0×10^-7～8．0×10^-5g／mL范围内的L-抗坏血酸呈线性关系，相关系数为0．9998，检出限为5．0×10^-8g／mL，对于1．0×10^-5g／mL的L-抗坏血酸溶液平行进行11次测试，RSD为0．63％．极谱波的波高至少稳定4h．讨论了测定中干扰物质的影响及机理包括循环伏安图、温度系数、表面活性剂的影响和电毛细管曲线．结果较之文献，扩大了线性范围，降低了检测下限，且方法简便快捷．It reports that L-ascorbic acid＇s polarographic oxidation wave in acid solution and its application. In 0.15 mol/L H3PO4 solution, L-ascorbic acid produces a sensitive oxidation wave at ＋ 0. 30 V （vs. SCE） . The current of mercury oxidation has no influence on the wave. Its second order derivative peak is sharp, symmetrical and more suitable for the determination of L-ascorbic acid. The peak height is linearly proportional to the concentration in the range of 1. 0× 10^-7 -8.0× 10^-5g/mL （the correlation coefficient 0. 999 8）. The detection limit is 5.0× 10^-5g/mL. The relative standard deviation for 11 independent determinations of 1.0× 10^-5g/mL L- ascorbic acid is 0. 630/00. The polarographic wave could be stable in 4h. The article discussed the affects of interfering materials and mechanism including cyclic voltammograms,temperature coefficient and electrocapillary curves. Compared with the results of literatures, it expand the scope of linear and reduce the lower limit. It is a simple and quick way.

关 键 词：单扫描极谱法 抗坏血酸 氧化波 

分 类 号：O657.14[理学—分析化学]