方波极谱法间接测定抗坏血酸  

Indirect Determination of Ascorbic Acid by Square Wave Polarography

作　　者：孙汝东[1] 严金龙[1] 孔岐忠[1] 

机构地区：[1]盐城工学院化学工程系,盐城224003

出　　处：《分析化学》2001年第6期707-709,共3页Chinese Journal of Analytical Chemistry

摘　　要：利用Ｃｕ２＋与抗坏血酸（Ｖｃ）的氧化还原反应，建立了一种间接测定Ｖｃ的方波极谱法。在ＮＨ３－ＮＨ４Ｃｌ缓冲溶液中，Ｃｕ２＋在约－０．２４ Ｖ（ｖｓ．ＳＣＥ）处出现一个可逆的 Ｃｕ２＋－Ｃｕ＋的还原峰，加入Ｖｃ可将Ｃｕ２＋还原，根据 Ｃｕ２＋还原峰峰高的降低量间接测定Ｖｃ，线性范围为２．０×１０－６～ ３．０×１０－４ｍｏｌ／Ｌ，该法还应用于实际样品Ｖｃ片剂的含量测定，ＲＳＤ为２．９％。An indirect square polarographic method was established for the determination of ascorbic acid in pharmaceuticals using the oxidation-reduction action between Cu2+ and ascorbic acid. There was a reduction wave of Cu2+ at about -0.24 V in buffer solution of NH3-NH4Cl. The quantities of ascorbic acid is determination according to the decrement of peak heights when ascorbic acid was added. The linear range for ascrobic acid was 2.0 x 10(-6) similar to 3.0 x 10(-4) mol/L. Ascorbic acid in Vitamin C tablets was determined, the relative standard deviation is 2.9%.

关 键 词：抗坏血酸 方波极谱法 测定 维C片剂 氧化还原反应 

分 类 号：O657.14[理学—分析化学]