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Poly(vinyl chloride)-based membranes of salen ligands, 2-((E)-((1R,2S)-2-((E)-5-tert-butyl-2-hydroxybenzylideneamino)cyclohexylimino)methyl)-4-tert-butyl phenol (S 1 ) and 2-((E)-((1R,2S)-2-((E)-3,5-di-tert-butyl-2-hydroxybenzylideneamino)cyclohexylimino)methyl)-4,6-di-tert-butylphenol (S 2 ) were fabricated and explored as cobalt(II) selective electrodes. The performance of the polymeric membrane electrode (PME) and coated graphite electrode (CGE) were compared and it was observed that CGE showed a wide working concentration range of 1.1 10 À8 to 1.0 10 À1 mol L À1 with a limit of detection of 7.0 10 À9 mol L À1 exhibiting the Nernstian slope 29.6 mV/decade of activity in the pH range 3.0-9.0. It was used for the determination of cobalt(II) ions in water, soil, beer, pharmaceutical samples and medicinal plants and would be used as an indicator electrode in potentiometric titration with EDTA.

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