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Sensors and Materials, Volume 29, Number 5 (2017)
Copyright(C) MYU K.K. All Rights Reserved.
pp. 555-565
S&M1349
http://dx.doi.org/10.18494/SAM.2017.1505
Published on May 10, 2017

Gold Nanoparticles/Ionophore-Modified Screen Printed Electrode for Detection of Pb(II) in River Water Using Linear Sweep Anodic Stripping Voltammetry

Samira Ashour B. Shoub, Nor Azah Yusof, and Reza Hajian

(Received November 18, 2016; accepted February 16, 2017)

Keywords: gold nanoparticles, ionophore, electrochemical sensor, Pb2+, river water, tap water

In this study, a screen-printed electrode (SPE) was modified with gold nanoparticles (AuNPs) and an ionophore (AuNPs/ionophore/SPE) to provide an electrochemical sensor for the sensitive and selective determination of lead ions using linear sweep anoding stripping voltammetry (LSASV). The effect of electrochemical parameters, including supporting electrolyte, pH, deposition potential, deposition time, and scan rate, on the sensitivity of the sensor for the detection of Pb2+ was investigated. Under optimized conditions [deposition time 240 s, deposition potential −1.2 V, Tris-HCl (0.1 mol L−1, pH 2), and scan rate of 0.1 Vs−1], the linear sweep voltammogram at −0.5 V was related to the concentration of Pb2+ in the range of 0.4 to 20 μg mL−1 Pb2+ with a limit of detection (LOD) of 0.082 μg mL−1. The method was used to determine Pb2+ ions in river and tap water with satisfactory results. The modified electrode displayed benefits such as high sensitivity and selectivity, long time stability, easy preparation, and wide linear range.

Corresponding author: Nor Azah Yusof, Reza Hajian

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SM1349

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