| Cu(Ⅱ)-抗坏血酸-三氯偶氮胂体系催化动力学光度法测定痕量铜的研究 |
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| 引用本文： | 缪吉根,陈建荣,吴小华.Cu(Ⅱ)-抗坏血酸-三氯偶氮胂体系催化动力学光度法测定痕量铜的研究[J].理化检验(化学分册),1999(8). |
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| 作者姓名： | 缪吉根 陈建荣 吴小华 |
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| 作者单位： | 浙江师范大学化学系 金华321004
(缪吉根，陈建荣)，浙江师范大学化学系 金华321004(吴小华) |
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| 基金项目： | 浙江省教委科研基金资助 |
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| 摘 要： | 在乙酸-乙酸钠缓冲溶液(pH4.4)中,以Cu(Ⅱ)催化抗坏血酸还原三氯偶氮胂褪色为指示反应,建立了测定痕量Cu(Ⅱ)的新方法.测定了反应级数和表观活化能.在70℃水浴中加热6min,测定的灵敏度为3.1×10~(-12)g·ml~(-1),线性范围为0～70ng/25ml.用于测定几种中草药样品中的铜,结果满意,相对标准偏差小于3%.
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| 关 键 词： | 催化动力学光度法 三氯偶氮胂 测定 中草药 铜 |
CATALYTIC-KINETIC PHOTOMETRIC DETERMINATION OF TRACE COPPER WITH THE REACTION SYSTEM OF TRICHLOROARSENAZO-ASCORBIC ACID-COPPER ( 1 ) |
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| Miao Jigen,Chen Jianrong and Wu Xiaohua.CATALYTIC-KINETIC PHOTOMETRIC DETERMINATION OF TRACE COPPER WITH THE REACTION SYSTEM OF TRICHLOROARSENAZO-ASCORBIC ACID-COPPER ( 1 )[J].Physical Testing and Chemical Analysis Part B:Chemical Analgsis,1999(8). |
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| Authors: | Miao Jigen Chen Jianrong and Wu Xiaohua |
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| Abstract: | The decoloration reaction of trichloroarsenazo by the reduction with ascorbic acid is found to be catalyzed by the presence of trace amounts of copper ( I ) in a HOAc-NaOAc buffer medium of pH 4.4. Based on this effect a new catalytic kinetic photometric method for the determination of traces of copper is proposed. The linear range of the determination is in the range 0~70ng of copper ( I ) per 25ml. The detection limit is 3.1?10~(-12)g ?ml~(-1). This method has been applied to the determination of traces of copper in some traditional chinese medicines. The RSD obtained is 3.0%. |
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| Keywords: | Catalytic-kinetic photometry Copper ( I ) Trichloroarsenazo Traditional Chinese medicines |
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