| 天然水中痕量铜的荧光测定 |
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| 引用本文： | 张路端,刘建青,章竹君. 天然水中痕量铜的荧光测定[J]. 高等学校化学学报, 1988, 9(5): 516 |
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| 作者姓名： | 张路端 刘建青 章竹君 |
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| 作者单位： | 陕西师范大学化学系 |
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| 摘 要： | 8-苯胺基-1-萘磺酸(ANS)可作为蛋白质研究的荧光探针[1~3],ANS与可溶性的聚乙烯亚胺在微酸性溶液中以缔合物的形式结合,产生强烈的荧光并使ANS在水中的荧光激发和发射光谱分别产生红移和紫移,斯托克斯位移减小.当有痕量铜存在时,聚乙烯亚胺将与铜离子键合成聚合阳离子,它同ANS阴离子生成离子对后,由于ANS微环境极性的增强,导致荧光熄灭[4],利用这一性质将水中痕量和超痕量的铜用巯基棉分离富集后进行测定,获得了满意结果,铜的检测下限为4.7ppb,对5至100ppb含量范围内铜的测定,相对标准偏不大于2.0%。
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| 关 键 词： | 荧光法 铜 痕量分析 |
| 收稿时间： | 1986-10-28 |
Determination of Trace Copper in Natural Water by Fluororoetry |
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| Zhang Luduan,Liu lianqing,Zhang Zhujun. Determination of Trace Copper in Natural Water by Fluororoetry[J]. Chemical Research In Chinese Universities, 1988, 9(5): 516 |
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| Authors: | Zhang Luduan Liu lianqing Zhang Zhujun |
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| Affiliation: | Department of Chemistry Shaanxi Normal University, Xian |
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| Abstract: | A new method based on fluorescence quenching for determination of trace copper is reported,8-anilino-1-naphthalenesulfoic acid(ANS) is an important fluorescence probe. It can combine with polyethyleneimine- and makes an increase of quantum efficiency of fluorescence. Copper combines with polyethyleneimine to form strong complex. ANS can be bound to cationic copper-polyethyleneimine polymer as an ion pair. On the polymer the paramagnetic copper ion causes fluorescence to be quenched. These reactions can be applied to determining the trace copper in natural water after separation and preconcentration by sulfhydryl cotton fiber. The detection limit is 4.7 ppb. The relative standard error is not higher than 2.0% for determination of copper in range of 5 to 100ppb. |
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| Keywords: | Fluorometry Copper Trace analysis |
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