| 2-（5-氯-2-吡啶偶氮）-5-二乙基氨基酚作络合滴定指示剂测定锌 |
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| 引用本文： | 李山 刘根起. 2-（5-氯-2-吡啶偶氮）-5-二乙基氨基酚作络合滴定指示剂测定锌[J]. 岩矿测试, 2006, 25(1): 95-96 |
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| 作者姓名： | 李山 刘根起 |
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| 作者单位： | 1. 长安大学环境科学与工程学院,陕西,西安,710054
2. 西北工业大学化工系,陕西,西安,710072 |
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| 摘 要： | 对2-（5-氯-2-吡啶偶氨）-5-二乙基氨基酚（5-Cl-DEPAP）作锌的络合滴定指示剂进行了实验。在pH5．5的HAc—NaAc介质中，以5-Cl-DEPAP作指示剂，EDTA标准溶液滴定锌，溶液颜色由紫红色变为亮黄色，终点变化敏锐，易于观察，锌量在0-25mg与EDTA消耗量成正比。方法用于化学试剂和铝合金中锌的测定，5次测定的RSD小于0．1％。结果表明，5-Cl-DEPAP符合络合滴定对指示剂的基本要求，扩大了该试剂的应用范围。
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| 关 键 词： | 指示剂 2-(5-氯-2-吡啶偶氮)-5-二乙基氨基酚 络合滴定 锌 |
| 文章编号： | 0254-5357（2006）01-0095-02 |
| 收稿时间： | 2005-04-14 |
| 修稿时间： | 2005-04-142005-08-06 |
Determination of Zinc by Complexometric Titration with 2-(5-Chloro-2-Pyridylazo)-5-Diethylaminophenol Indicator |
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| LI Shan,LIU Gen-qi. Determination of Zinc by Complexometric Titration with 2-(5-Chloro-2-Pyridylazo)-5-Diethylaminophenol Indicator[J]. Rock and Mineral Analysis, 2006, 25(1): 95-96 |
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| Authors: | LI Shan LIU Gen-qi |
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| Abstract: | An accurate and selective method for the determination of zinc by complexometric titration was developed.In the medium of acetic acid-sodium acetate(pH=5.5) and with 2-(5-chloro-2-pyridylazo)-5-diethylaminophenol(5-Cl-DEPAP) as indicator,the amount of zinc is directly in proportion to EDTA solution consumed in a range of 0~25 mg of zinc with a sharp end point.The method has been applied to the determination of zinc in chemical reagents and aluminum alloy with precision of less than 0.1% RSD(n=5). |
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| Keywords: | indicator 2-(5-chloro-2-pyridylazo)-5-diethylaminophenol(5-Cl-DEPAP) complexometric titration zinc |
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