| 方波极谱法间接测定抗坏血酸 |
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| 引用本文： | 孙汝东,严金龙,孔岐忠.方波极谱法间接测定抗坏血酸[J].分析化学,2001,29(6):707-709. |
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| 作者姓名： | 孙汝东 严金龙 孔岐忠 |
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| 作者单位： | 盐城工学院化学工程系, |
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| 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％。
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| 关 键 词： | 抗坏血酸 方波极谱法 测定 维C片剂 氧化还原反应 |
Indirect Determination of Ascorbic Acid by Square Wave Polarogra phy |
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| Sun Rudong,Yan Jinlong,Kong Qizhong.Indirect Determination of Ascorbic Acid by Square Wave Polarogra phy[J].Chinese Journal of Analytical Chemistry,2001,29(6):707-709. |
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| Authors: | Sun Rudong Yan Jinlong Kong Qizhong |
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| Abstract: | An indirect square polarographic method was established f or the determination of ascorbic acid in pharmaceuticals using the oxidation-re duction action between Cu2＋ and ascorbic acid. There was a reduction wav e of Cu2＋ at about －0．24 V in buffer solution of NH3-NH4 Cl. 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 2.0×10－6～3．0×10－4 mol/L. Ascorbic acid in Vitami n C tablets was determined, the relative standard deviation is 2.9%. |
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