Issue 3, 2012

Comparative studies on carbon paste electrodes based on three dithiocarbamate podands as ionophore in Ag(i) sensors

Abstract

Three dithiocarbamate podands, [N,N′(bis[(1-oxoethyl) morpholine-2-carbodithioate])-2,6- diaminopyridine] (P1), [N,N′(bis [(1-oxoethyl)piperidine-2-carbodithioate])-2,6-diaminopyridine] (P2) and [N,N′(bis[(1-oxoethyl)diethylamine-2-carbodithioate])-2,6-diaminopyridine] (P3) have been synthesized and used as ionophores for Ag+-selective carbon paste electrodes. The construction, response characteristic and application of the silver ISEs are investigated. Potentiometric responses reveal that the flexibility of the ligands has a great effect on the selectivity and sensitivity toward Ag+ ions. Among the podands, the best performance was achieved with the sensor using P1 as ionophore. The proposed sensor exhibits Nernstian response with the slope of 58.6 ± 0.6 mV/decade in the concentration range of 8.2 × 10−8–1.5 × 10−2 mol L−1 of Ag+ and a lower detection limit of 6.3 × 10−8 mol L−1. The linear concentration range of the electrodes modified with P2 and P3 were also 2.5 × 10−6–1.2 × 10−2 and 6.3 × 10−7–1.2 × 10−2 mol L−1, respectively. The response time of the electrode based on p1 was 8 s and its potential was independent of pH in the range of 2.9–8.2. The electrodes were highly selective to Ag+ ions over a large number of mono, bi, and tri-valent cations which make them unique in the analysis of real samples.

Graphical abstract: Comparative studies on carbon paste electrodes based on three dithiocarbamate podands as ionophore in Ag(i) sensors

Article information

Article type
Paper
Submitted
05 Sep 2011
Accepted
09 Dec 2011
First published
03 Feb 2012

Anal. Methods, 2012,4, 742-747

Comparative studies on carbon paste electrodes based on three dithiocarbamate podands as ionophore in Ag(I) sensors

M. H. Mashhadizadeh, R. P. Talemi, A. Shockravi and M. Kamali, Anal. Methods, 2012, 4, 742 DOI: 10.1039/C2AY05559G

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