| L-半胱氨酸选择释放络合滴定铜、汞 |
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| 引用本文： | 王中东.L-半胱氨酸选择释放络合滴定铜、汞[J].甘肃冶金,2014(4):93-96. |
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| 作者姓名： | 王中东 |
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| 作者单位： | 甘肃省核地质二一九大队,甘肃天水741025 |
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| 摘 要： | 本文研究在pH为5~6酸度下,以二甲酚橙作指示剂,加入过量的EDTA,使溶液中的Cu2+、Hg2+及其它金属离子与之完全络合,用硝酸铅滴定过量的EDTA,然后加入L-半胱氨酸掩蔽剂,破坏Cu2+、Hg2+—EDTA络合物,释放出EDTA用硝酸铅反滴定。该方法也可以单独测定铜或汞,有较高的选择性与准确度,且操作简单、快速,测定结果令人满意。
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| 关 键 词： | 铜 汞 L-半胱氨酸掩蔽剂 返滴定 |
L-cysteine Choose Complexometric Titration Copper,Mercury Release |
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| WANG Zhong-dong.L-cysteine Choose Complexometric Titration Copper,Mercury Release[J].Gansu Metallurgy,2014(4):93-96. |
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| Authors: | WANG Zhong-dong |
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| Affiliation: | WANG Zhong-dong ( Nuclear Geological Brigade 219, Gansu Province, Tianshui 741025,China) |
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| Abstract: | In this paper under the pH for 5～6 acidity, with xylenol orange as indicator , to join the excessive EDTA , Cu2＋in the solution, Hg2＋and other completely complexation with metal ions , with the excessive EDTA lead nitrate titration , then add the masking agent , l-cysteine Cu2＋, Hg2＋-EDTA complex, release the EDTA with lead nitrate titration .This method can also be a separate determination of copper or mercury , higher selectivity and accuracy , and the operation is simple, rapid, the determination results is satisfactory . |
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| Keywords: | copper mercury L-cysteine masking agent back titration |
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