Sn (II) Ion- Selective Membrane Electrode based on Dibenzo-18-Crown-6

Document Type : Research Paper


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We found that dibenzo-18-crown-6 (DB18C6) can be used as an ionophore to make a tin (II)-ionselective
membrane electrode. The electrode exhibits a near Nernstian response for Sn2+ ions over a
concentration range from 1.0× 10-6 – 1.0× 10-2 M with a slope of 27.5 ± 0.6 mV per concentration decade
in an acidic solution (pH=1). The limit of detection was 8.0× 10-7 M. It has a response time of < 20s and
can be used for at least 3 months without any divergence in potentials. The proposed membrane electrode
revealed very good selectivity for Sn2+ ions over a wide variety of other cations and could be used in
acidic media. It was used as indicator electrode in potentiometric determination of tin (II) ion in real