Tin(II) selective PVC membrane electrode based on salicylaldehyde thiosemicarbazone as an ionophore

A polymeric membrane-based tin selective electrode was developed by using salicylaldehyde thiosemicarbazone (stsc). the best performance was recorded with a membrane composition of pvc: tbp: ionophore: natpb as 28: 59: 8: 5 (w/w). the nernstian slope calculated from the calibration curve for sn 2+ sensor was 28.8 ± 0.4 mv/decade. the detection limit of the sensor was 2.10 × 10 -8 m,in the linear concentration range of 1.0 × 10 -2 - 1.1 × 10 -7 m. it was relatively fast response time (8 s for concentration ≥ 1.0 × 10 -4 and 12 s for concentration of ≥ 1.0 × 10 -6m) and can be used for 9 months without any considerable divergence in potentials. the proposed sensor exhibit relatively good selectivity and high sensitivity for tin(ii) as other mono-,di-,and trivalent cations and can be used in a ph range of 2.08.5. the analytical usefulness of the proposed electrode has been evaluated by its application in the determination of stannous in artificially made samples. © 2012 sulekh chandra et al.