Determination of the Free Metal Ion Concentration Using AGNES Implemented with Environmentally Friendly Bismuth Film Electrodes

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• 作者：Luciana S. Rocha ; Josep Galceran ; Jaume Puy ; Jos茅 Paulo Pinheiro
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：June 16, 2015
• 年：2015
• 卷：87
• 期：12
• 页码：6071-6078
• 全文大小：342K
• ISSN：1520-6882

文摘

Ex situ plated Bi film electrodes (Bi-FE) have been employed, for the first time, to measure the free concentration of Pb(II) in aqueous solutions using absence of gradients and Nernstian equilibrium stripping (AGNES) with stripping chronopotentiometry (SCP) quantification. The amount of deposited Pb掳, below a certain threshold, follows a Nernstian relationship with the applied potential. This threshold can be interpreted as the frontier of transition from surface deposition to solid (bulk) formation of Pb掳. AGNES with Bi-FE yielded a very good detection limit (3蟽) for Pb(II) of 6.0 脳 10^鈥? M with an applied gain of 398 and a deposition time of 400 s. The ability of the Bi film electrode to perform speciation measurements was demonstrated for Pb(II)鈥揚SS and Pb(II)鈥揑DA systems. The measured values with the Bi-FE were in good agreement with the values obtained using the Hg film electrode and/or the values reported in the literature.