| 萃取催化动力学光度法测定痕量钼 |
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| 引用本文： | 朱庆仁,孙登明,李海燕. 萃取催化动力学光度法测定痕量钼[J]. 光谱学与光谱分析, 2002, 22(1): 107-109 |
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| 作者姓名： | 朱庆仁 孙登明 李海燕 |
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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： | 安徽省教育厅自然科学基金资助课题 (99JL0 1 80 ) |
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| 摘 要： | 研究了在pH 5 5的弱酸性介质中 ,利用钼 (Ⅵ )催化过氧化氢氧化邻氨基酚显色的指示反应 ,用萃取平衡控制反应时间和水相中邻氨基酚的浓度及反应程度 ,通过测量 42 4nm处有机相的吸光度 ,建立了萃取催化动力学光度法测定痕量钼的新方法 ,方法的线性范围为 0 0 0 5 0～ 2 0mg·L- 1 ,检出限为 2 0× 10 - 6g·L- 1 。用于豆类中钼的测定 ,结果满意
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| 关 键 词： | 萃取 催化动力学光度法 邻氨基酚 钼 测定 豆类 过氧化氢 邻氨基酚 |
| 文章编号： | 1000-0593(2002)01-0107-03 |
| 修稿时间： | 2000-12-21 |
Determination of Trace Molybdenum by Extraction Catalytic Kinetic Spectrophotometry |
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| ZHU Qing-ren,SUN Deng-ming,LI Hai-yan. Determination of Trace Molybdenum by Extraction Catalytic Kinetic Spectrophotometry[J]. Spectroscopy and Spectral Analysis, 2002, 22(1): 107-109 |
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| Authors: | ZHU Qing-ren SUN Deng-ming LI Hai-yan |
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| Affiliation: | Department of Chemistry, Huaibei Coal Normal College, Huaibei 235000, China. |
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| Abstract: | A new extraction catalytic kinetic spectrophotometric method for the determination of trace molybdenum is studied. The method is based on the molybdenum (VI) catalytic oxidation of o-aminophenol by hydrogen peroxide in week acidic medium at pH 5.5. The reaction is carried out at room temperature. The reaction time, concentration of o-aminophenol in aqueous phase and degree of reaction are controlled by extraction equilibrium. The absorbance of organic phase is measured at 424 nm. Under the optimum experiment conditions, the linear range of the determination is 0.0050-2.0 mg.L-1, the detection limit is 2.0 x 10(-6) g.L-1. Combining with separation of ionic exchange, the method has been applied to the determination of trace molybdenum in bean samples with satisfactory results. The kinetic equation of extraction catalytic reaction is discussed. |
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| Keywords: | Extraction Catalytic spectrophotometry o-aminophenol Molybdenum |
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