Asian Journal of Research in Chemistry

Geetu Bansal ¹, Susheel Kumar Sindhu ²

Affiliations
1 Department of Chemistry, Guru Premsukh Memorial College of Engineering, 245, G.T. Karnal Road, Budhpur, Delhi-110036, IN
2 Department of Chemistry, S.S.V. P.G. College, Hapur, IN

Abstract

The preparation of silver ion selective polymer membrane and its application to ion selective electrode is reported here. PVC membrane contains silver selective N, N’ [1, 1’-dithiobis (phenyl)]bis(5’methoxysalicyl-aldimine) (5-MeOSalps) as ionophore. The sensor possess a nernstian slope of 58.20±0.5 mV per decade over a wide linear concentration of 1.0×10^-1 to 1.0×10^-6 M with a detection limit of 5.0×10^-6 M. The electrode response is stable over wide pH range of 4.5-10.5. It has a fast response time of 5 s and can be used for more than 5 min. without any considerable change in potential. The proposed electrode shows good selectivity over a variety of alkali, alkaline earth and transition metal ions.

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Susheel Kumar Sindhu ¹, Sunil Kumar ¹, L. R. Singh ²

Affiliations
1 Department of Chemistry, S.S.V. Post Graduate College, Hapur, IN
2 Department of Chemistry, B.S.A. College, Mathura (U.P.), IN

Abstract

A PVC membrane based nickel (II) selective electrode was constructed using 11,14-diaza-4,7-dioxo-2(3),8(9)-dibenzoyl-cyclotetradeca-10,14(1)-diene (DADOCTD) as a neutral carrier. The sensor exhibits a Nernstian response for Ni (II) ions over a wide concentration range of 3.9×10^-6-1.0×10^-1 with a slope of 29.0 mV/decade. It has a relatively fast response time and can be used for 120 days without any considerable divergence in potentials. The proposed sensor revealed relatively good selectively and high sensitivity for Ni (II) over a bi-, tri- and tetravalent metal ions and could be used in a pH range of 3-8. It was successfully also used as an indicator electrode in potentiometer titration and in analysis of concentration of nickel in real samples.

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Susheel Kumar Sindhu ¹, Yogender Singh ¹, Reetu Singh ¹

Affiliations
1 Department of Chemistry, S.S.V. Post Graduate College, Hapur, IN

Abstract

Functionalized calixarene molecules 5,11,17,23-tetra-tert-butyl-25,26,27-tris (chlorocarbonylmethoxy)-28-hydroxycalix [4] arene for Cd (II) and 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis (chlorocarbonylmethoxy) calix [4] arene for Ni (II) were tested as a possible ionophore in ion selective electrodes (ISEs) and successfully applied for the detection of heavy metals ions from environmental and industrial waste waters. These electrodes gave more stable potential readings when used around neutral pH 5.5-8.5 in both cases. The sensors were found to work satisfactorily in partially non-aqueous media up to 25% (v/v) content of acetone, methanol or ethanol and could be used over a period of 5 months. Potentiometric selectivity coefficients as determined by match potential method (MPM) indicate excellent selectivity for Cd²⁺ and Ni²⁺ ions. The sensors could be used successfully in the estimation of cadmium and nickel in electrochemical battery wastes and also as indicator electrodes in potentiometric titration.

Keywords

Calixarene Ionophores, PVC, Ion Selective Electrodes, Cd²⁺ and Ni²⁺, Potentiometry.

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