Picomolar Detection Limits with Current-Polarized Pb2+ Ion-Selective Membranes

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• 作者：É ; va Pergel ; Robert E. Gyurcsá ; nyi ; Klá ; ra Tó ; th ; and Ernö ; Lindner
• 刊名：Analytical Chemistry
• 出版年：2001
• 出版时间：September 1, 2001
• 年：2001
• 卷：73
• 期：17
• 页码：4249 - 4253
• 全文大小：60K
• 年卷期：v.73,no.17(September 1, 2001)
• ISSN：1520-6882

文摘

Minor ion fluxes across ion-selective membranes biassubmicromolar activity measurements with conventionalion-selective electrodes. When ion fluxes are balanced,the lower limit of detection is expected to be dramaticallyimproved. As proof of principle, the flux of lead ionsacross an ETH 5435 ionophore-based lead-selectivemembrane was gradually compensated by applying a fewnanoamperes of galvanostatic current. When the oppositeion fluxes were matched, and the undesirable leaching ofprimary ions was eliminated, Nernstian response downto 3 × 10^-12 M was achieved.