Calixarene/Nafion-Modified Bismuth-Film Electrodes for Adsorptive Stripping Voltammetric Determination of Lead

✍ Scribed by Ferenc Torma; Alajos Grün; Isván Bitter; Klára Tóth

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 172 KB
• Volume: 21
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200904634

✦ Synopsis

Abstract

This paper presents an enhanced adsorptive stripping voltammetric procedure (AdSV) for the determination of Pb^2+^, which relies on the accumulation of the metals at a calixarene‐based chemically modified bismuth‐film electrode on glassy carbon substrate. Following the accumulation of the target metals at open circuit and a medium exchange, both the square wave anodic stripping detection of the metal ions and the in situ bismuth‐film formation was performed simultaneously in a Bi^3+^ containing supporting electrolyte. The analysis of Pb^2+^ under optimized conditions resulted in stripping responses with good linearity (in the range 0.05–0.6 μM) and precision (RSD=1.12% at 0.2 μM Pb^2+^; n=10) and low detection limit (0.02 μg/L at 10 min preconcentration). The determination of Pb^2+^ (0.4 μM) at 100‐fold excess of interfering ions (Cd^2+^, Cu^2+^ and Zn^2+^) yielded well resolved lead signal. The analytical utility of the method elaborated was tested in the analysis of trace Pb^2+^ in environmental water samples.