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首页> 外文期刊>RSC Advances >First investigation of polyoxoniobate and polyoxotantalate aqueous speciation by capillary zone electrophoresis
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First investigation of polyoxoniobate and polyoxotantalate aqueous speciation by capillary zone electrophoresis

机译：毛细管区带电泳对聚氧铌酸酯和聚氧钛酸酯水溶液形态的首次研究

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摘要

Aqueous solutions of hexaniobate (HxNb6O19x-8, 0 <= x <= 3) and hexatantalate ions (HxTa6O19x-8, 0 <= x <= 3) have been probed by capillary zone electrophoresis (CE) for the first time. Taking advantage of the UV properties of HxTa6O19x-8 and HxNb6O19x-8, the detection of Nb(V) and Ta(V) could be performed without using toxic or expensive chelating reagents as reported in CE methods previously developed for Nb and Ta samples. The effective electrophoretic mobilities of the hexaniobate and hexatantalate ions were measured as a function of pH in Li+, Na+ and K+-based alkaline media at 25 degrees C. Although HxTa6O19x-8 and HxNb6O19x-8 have almost identical electronic and structural features, they were easily separated in a wide pH range (9 to 13) using standard bare-fused silica capillary. The separation of Nb and Ta was accomplished in 5 minutes, which affords a promising method for the analytical support of industrial processes. The striking difference observed in the mobilities of HxTa6O19x-8 and HxNb6O19x-8 also led to new insights regarding the ion-association behavior of these highly charged species.
机译：首次通过毛细管区带电泳（CE）探测六铌酸盐（HxNb6O19x-8，0 <= x <= 3）和六钽酸盐离子（HxTa6O19x-8，0 <= x <= 3）的水溶液。利用HxTa6O19x-8和HxNb6O19x-8的紫外线特性，可以在不使用有毒或昂贵螯合剂的情况下进行Nb（V）和Ta（V）的检测，如先前针对Nb和Ta样品开发的CE方法所报道的那样。在25摄氏度下，测量Li +，Na +和K +基碱性介质中己酸根和六钽酸根离子的有效电泳迁移率随pH的变化。尽管HxTa6O19x-8和HxNb6O19x-8具有几乎相同的电子和结构特征，使用标准的裸露石英毛细管，可在很宽的pH范围（9至13）中轻松分离。 Nb和Ta的分离在5分钟内完成，这为工业过程的分析支持提供了一种有希望的方法。 HxTa6O19x-8和HxNb6O19x-8的迁移率中观察到的显着差异也导致了有关这些高电荷物种的离子缔合行为的新见解。

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