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Sensors 2004, 4(8), 125-135; doi:10.3390/s40800125

Samarium (III) Selective Membrane Sensor Based on Tin (IV) Boratophosphate

School of Chemistry & Biochemistry, Thapar Institute of Engineering & Technology (Deemed University), Patiala 147004, India
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Received: 9 March 2004 / Accepted: 28 August 2004 / Published: 30 August 2004
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Abstract

A number of Sm (III) selective membranes of varying compositions using tin (IV) boratophosphate as electroactive material were prepared. Polyvinyl chloride, polystyrene and epoxy resin were used as binding materials. Membrane having composition of 40% exchanger and 60% epoxy resin exhibited best performance. This membrane worked well over a wide concentration range of 1x10-5M to 1x10-1 M of samarium ions with a Super-Nernstian slope of 40 mV/decade. It has a fast response time of less than 10 seconds and can be used for at least six months without any considerable divergence in potentials. The proposed sensor revealed good selectivities with respect to alkali, alkaline earth, some transition and rare earth metal ions and can be used in the pH range of 4.0-10.0. It was used as an indicator electrode in the potentiometric titration of Sm (III) ions against EDTA. Effect of internal solution was studied and the electrode was successfully used in non-aqueous media, too.
Keywords: Inorganic ion exchanger; ISE; Sm (III); FIM; potentiometric titration Inorganic ion exchanger; ISE; Sm (III); FIM; potentiometric titration
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mittal, S.K.; Sharma, H.K.; Kumar, A.S.K. Samarium (III) Selective Membrane Sensor Based on Tin (IV) Boratophosphate. Sensors 2004, 4, 125-135.

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