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An electrochemical sensor based on Fe3O4@PANI nanocomposites for sensitive detection of Pb2+ and Cd2+

Abstract

In this work, an easy-to-use electrochemical sensor was developed for the quantitative detection of lead ions (Pb2+) and cadmium ions (Cd2+). Core-shell ferroferric oxide@polyaniline (Fe3O4@PANI) nanoparticles were used as a sensitive platform for the detection of Pb2+ and Cd2+. Fe3O4 with large specific surface area can increase the sensitivity for detection. PANI as a conductive polymer with excellent electronic conductivity can not only improve the electron transport speed in the detection process, but also produce good chelation with heavy ions. PANI contains a large number of amino and imino groups on surface, thereby improving the detection sensitivity. Under the optimal experimental conditions, the linear ranges for the detection of Pb2+ were from 0.1 to 104 nmol•L-1, and the detection limit was 0.03 nmol•L-1, error limit of LOD was 1.1%, LOQ was 0.09 nmol•L-1. The calculated LOD of Cd2+was 0.3 nmol•L-1, the error limit of LOD was 1.5%, LOQ was 0.9 nmol•L-1. The prepared electrochemical sensor presented high sensitivity and good specificity and excellent stability which is straightforward and easy to operate. This analysis strategy has a huge application prospect in the detection of other heavy metal ions.

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Publication details

The article was received on 31 May 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8AY01245H
Citation: Anal. Methods, 2018, Accepted Manuscript
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    An electrochemical sensor based on Fe3O4@PANI nanocomposites for sensitive detection of Pb2+ and Cd2+

    Y. Kong, T. Wu, D. Wu, Y. Zhang, Y. Wang, B. Du and Q. Wei, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY01245H

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