| 催化动力学光度法测定痕量抗坏血酸 |
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| 引用本文： | 张振新,孙登明,荣振海.催化动力学光度法测定痕量抗坏血酸[J].光谱学与光谱分析,2004,24(7):873-875. |
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| 作者姓名： | 张振新 孙登明 荣振海 |
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| 作者单位： | 淮北煤炭师范学院化学系,安徽,淮北,235000 |
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| 基金项目： | 安徽省高校自然科学基金(99JL0180,2001KJ196)资助课题 |
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| 摘 要： | 研究了在pH4 5的HAc NaAc缓冲介质中 ,利用抗坏血酸对钒催化溴酸钾氧化还原型罗丹明B显色反应具有强烈的活化作用 ,建立了催化动力学光度法测定抗坏血酸的新方法。方法的线性范围为 0～ 7 0 μg·mL- 1 ,检出限为 2 5× 10 - 7g·mL- 1 ,用于维生素C片和西红柿中抗坏血酸的测定 ,结果满意。
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| 关 键 词： | 抗坏血酸 动力学光度法 还原型罗丹明B |
| 文章编号： | 1000-0593(2004)07-0873-03 |
| 修稿时间： | 2002年6月28日 |
Catalytic Kinetic Spectrophotometric Determination of Trace Ascorbic Acid |
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| Zhang Zhen-xin,Sun Deng-ming,Zhen-hai Rong.Catalytic Kinetic Spectrophotometric Determination of Trace Ascorbic Acid[J].Spectroscopy and Spectral Analysis,2004,24(7):873-875. |
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| Authors: | Zhang Zhen-xin Sun Deng-ming Zhen-hai Rong |
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| Institution: | Department of Chemistry, Huaibei Coal Normal College, Huaibei 235000, China. |
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| Abstract: | In this paper, a new catalytic kinetic spectrophotometric method for the determination of trace amounts of ascorbic acid has been studied. The method is based on the activation effect of ascorbic acid on vanadium (V) catalyzed oxidation of deoxidized rhodamine B by potassium bromate in weak acidic medium at pH 4.5. The optimal experimental conditions have been discussed. The absorbance was measured at 555 nm. The linear range of the method was 0-7.0 microg x mL(-1). The detection limit for ascorbic acid was 2.5 x 10(-7) g x L(-1). The method has been applied to the determination of ascorbic acid in vitamin C tablet and tomato with satisfactory results. |
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| Keywords: | Ascorbic acid Kinetic spectrophotometry Deoxidized rhodamine B |
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