Copper (II) ion selective liquid membrane electrode based on new Schiff base carrier |
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Authors: | Sadeghi Susan Vardini Mohammad Taghi Naeimi Hossein |
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Institution: | Department of Analytical Chemistry, Faculty of Science, P.O.Box 414, University of Birjand, Birjand, Iran. ssadeghi@birjand.ac.ir |
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Abstract: | Cu2+ selective PVC membrane electrode based on new Schiff base 2, 2'-1,9 nonanediyl bis (nitriloethylidyne)]-bis-(1-naphthol) as a selective carrier was constructed. The electrode exhibited a linear potential response within the activity range of 1.0 x 10(-6) - 5.0 x 10(-3) moll(-1) with a Nernstian slope of 29 +/- 1 mV decade(-1) of Cu2+ activity and a limit of detection 8.0 x 10(-7) mol l(-1). The response time of the electrode was fast, 10 s, and stable potentials were obtained within the pH range of 3.5- 6.5. The potentiometric selectivity coefficients were evaluated using two solution method and revealed no important interferences except for Ag+ ion. The proposed electrode was applied as an indicator electrode to potentiometric titration of Cu2+ ions and determination of Cu2+ content in real samples such as black tea leaves and multivitamin capsule. |
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