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|標題:||Voltammetric behavior and trace determination of Pb2+ at a mercury-free screen-printed silver electrode||作者:||Zen, J.M.
|關鍵字:||lead;screen-printed electrode;silver;underpotential deposition;scanning-tunneling-microscopy;anodic-stripping voltammetry;carbon;electrodes;underpotential deposition;copper;lead;acid||Project:||Analytica Chimica Acta||期刊/報告no：:||Analytica Chimica Acta, Volume 464, Issue 2, Page(s) 229-235.||摘要:||
Screen-printed silver electrodes (AgSPEs), without chemical modification, has been investigated as disposable sensors for the measurement of trace levels of Pb2+. potential segment analysis indicates that the formation of underpotential and bulk depositions of Pb is not strongly coupled on the AgSPE. The possibility of determining Pb2+ at trace levels using the reversible underpotential deposition peak was examined by square-wave anodic stripping voltammetry without removal of oxygen. Under the optimized analytical conditions, the obtained sensitivity, linearity, and detection limit are 0.355 muA/ppb, 5-80 ppb (r = 0.9992), and 0.46 ppb (S/N = 3), respectively. The electrode is quite stable for repetitive measurements. The interference effect was thoroughly studied with various metals and no significant change in current was found in the determination of 5 ppb Pb2+. The practical applications were demonstrated to measure trace Pb2+ in natural waters. (C) 2002 Elsevier Science B.V. All rights reserved.
|Appears in Collections:||化學系所|
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