Improved potentiometric response of solid-contact lanthanum (III) selective electrode

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• 作者：Xiujuan Yuan ; Yaqin Chai ; ^{yqchai@swu.edu.cn} ; Ruo Yuan ; Qiang Zhao
• 关键词：Carbon paste electrode ; Potentiometric ; ¦Ð&ndash ; ¦Ð stacking ; Superparamagnetic Fe3O4 nanoparticles ; Graphene
• 刊名：Analytica Chimica Acta
• 出版年：2013
• 出版时间：24 May, 2013
• 年：2013
• 卷：779
• 期：Complete
• 页码：35-40
• 全文大小：1437 K

文摘

For the first time, the analytical application of integrate ionophore-transducer material based on magnetic graphene hybrids and 2,2-dithiodipyridine (DTDP) in solid-contact lanthanum (III) selective electrode is reported. The attachment of Fe₃O₄ nanoparticles (NPs) to graphene oxide (GO) for magnetic graphene hybrid is achieved by covalent bonding, and the universal problem, Fe₃O₄ NPs may easily leach out from the graphene during application, is successfully solved by the method above. The proposed electrode exhibits an excellent near-Nernstian response to lanthanum (III) ranging from 1.0 ¡Á 10^?9 to 1.0 ¡Á 10^?3 M with a slope of 17.81 mV/dec. Moreover, the excellent performance on fairly good selectivity, wide applicable pH range (3.0^_8.0), fast response time (10 s) and long life time (2 months) reveal the superiority of the electrode. Most importantly, we have made a great improvement in the detection limit (2.75 ¡Á 10^?10 M), which brings new dawn to the real-time detection of lanthanum (III) using ion selective electrode.