Construction and performance characteristics of chemically modified carbon paste electrodes for the selective determination of Co(II) ions in water samples

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• 作者：Tamer Awad Ali^a ; ^{dr_tamerawad@yahoo.com} ; Gehad G. Mohamed^b ; M.M. Omar^b ; Noha M. Hanafy^b
• 关键词：Schiff base ionophores ; Potentiometeric determination ; Cobalt ions ; Cobalt complexes ionophores ; Industrial waste water
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2017
• 出版时间：25 March 2017
• 年：2017
• 卷：47
• 期：Complete
• 页码：102-111
• 全文大小：1870 K
• 卷排序：47

文摘

The construction, performance characteristics and application of Co(II)-chemically modified carbon paste electrodes (CMCPEs) based on bis(salicylaldehyde)-o-phenylenediamine (Schiff base I, SalophH2; ionophore A), N-salicylidene-o-aminophenol (Schiff base II, SaphH2, ionophore B), [Co(Saloph)] complex (ionophore C) and [Co(Saph)OH2] complex (ionophore D) are reported in this paper. The CMCPEs are prepared by incorporating of A–D ionophores into a plasticized carbon paste electrodes to form electrodes I–IV sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.20 ± 1.13, 28.20 ± 2.07, 29.90 ± 0.26 and 28.80 ± 1.04 mV decade−1 towards Co(II) ion over a wide concentration range of 1.0 × 10−7–1.0 × 10−2, 7.9 × 10−7–1.0 × 10−2, 4.9 × 10−8–1.0 × 10−2 and 5.1 × 10−7–1.0 × 10−2 mol L−1 with a detection limit of 1.0 × 10−7, 7.9 × 10−7, 4.9 × 10−8 and 5.1 × 10−7 mol L−1 at pH range 3.0–8.0, 3.5–7, 2.0–8.0 and 2.5–7.5 for electrodes I–IV, respectively. The electrodes showed good selectivity for Co(II) ion toward a wide variety of metal ions. The proposed electrodes were successfully applied for the determination of Co(II) ion in real spiked water samples and the results obtained compared well with those obtained using inductively coupled plasma atomic emission spectrometry (ICP-AAS).