| 偶氮氯膦—DBC光度法测定银合金中镨 |
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| 引用本文： | 宋焕云,吴瑞林.偶氮氯膦—DBC光度法测定银合金中镨[J].理化检验(化学分册),2001,37(2):68-69,72. |
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| 作者姓名： | 宋焕云 吴瑞林 |
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| 作者单位： | 昆明贵金属研究所, |
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| 摘 要： | 研究提出镨 ( ) - DBC-偶氮氯膦 -磷酸 - EDTA新体系光度法测定贵金属合金中微量镨。反应体系生成 α型蓝色配合物的 λmax=650 nm,灵敏度高 ,摩尔吸光系数 ε=0 .93× 1 0 5L·mol-1·cm-1,镨浓度在 0～ 50 μg/2 5ml范围内符合比耳定律 ,方法选择性强 ,有较好的适用性 ,用于分析银合金中镨 ,标准偏差 S≤ 0 .0 1 1 ,相对标准偏差 RSD≤ 1 .97%。
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| 关 键 词： | DBC－偶氮氯膦 镰 光度法 银合金 分析方法 |
| 文章编号： | 1001-4020(2001)02-0068-02 |
PHOTOMETRIC DETERMINATION OF PRASEODYMIUM IN SILVER ALLOYS WITH CPA-DBC |
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| SONG Huan-yun,WU Rui-lin.PHOTOMETRIC DETERMINATION OF PRASEODYMIUM IN SILVER ALLOYS WITH CPA-DBC[J].Physical Testing and Chemical Analysis Part B:Chemical Analgsis,2001,37(2):68-69,72. |
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| Authors: | SONG Huan-yun WU Rui-lin |
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| Abstract: | A new color reaction of Pr(11) with chlorophosphonazo-DBC using EDTA as complexing reagent was studied. A stable blue colored complex is formed in a dilute phosphoric acid medium. Its absorption maxima lies at 650nm with a molar absorptivity of 9.3×104L·mol-1·cm-1. Beer's law holds over the range of 0～50μg/
25ml. This method has been applied successfully to the determination of micro-amounts of praseodymium in silver alloys. The standard deviation (S) and RSD of the method are found to be 0. 010 and 1.97%. The method is proved to be of high sensitivity and selectivity. |
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| Keywords: | Silver alloy Chlorophosphonazo DBC Praseodymium Photometry |
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