期刊
TALANTA
卷 138, 期 -, 页码 130-137出版社
ELSEVIER
DOI: 10.1016/j.talanta.2015.01.044
关键词
Crown ether-modified sensors; Electrochemical grafting; Metal determination; Stripping voltammetry; Artificial neural network
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [CTQ2013-41577-P, CTQ2012-32863]
- Catalonia program ICREA Academia
This work describes the immobilization of 4-carboxybenzo-18-crown-6 (CB-18-crown-6) and 4-carboxybenzo-15-crown-5 (CB-15-crown-5) assisted by lysine On aryl diazonium salt monolayers anchored to the surface of graphite-epoxy composite electrodes (GEC), and their use for the simultaneous determination of Cd(II), Pb(II) and Cu(II) by differential pulse anodic stripping voltammetry (DPASV). These modified electrodes display a good repeatability and reproducibility with detection and quantification limits at levels of mu g L-1 (ppb), confirming their suitability for the determination of Cd (II), Pb(II) and Cu(II) ions in environmental samples. The overlapped nature of the multimetal stripping measurements was resolved by employing the two-sensor array CB-15-crown-5-GEC and CB-18-crown-6-GEC, since the metal complex selectivity exhibited by the considered ligands could add some discrimination power. For the processing of the voltammograms, Discrete Wavelet Transform and Causal Index were selected as preprocessing tools for data compression coupled with an artificial neural network for the modeling of the obtained responses, allowing the resolution of mixtures of these metals with good prediction of their concentrations (correlation with expected values for an external test subset better than 0.942). (C) 2015 Elsevier B.V. All rights reserved.
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