Tin(II) Selective PVC Membrane Electrode Based on Salicylaldehyde Thiosemicarbazone as an Ionophore

Abstract

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 Sn2+sensor was28.8±0.4 mV/decade. The detection limit of the sensor was2.10×10−8 M, in the linear concentration range of1.0×10−2−1.1×10−7 M. It was relatively fast response time (<8 s for concentration≥1.0×10−4and <12 s for concentration of≥1.0×10−6 M) 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 2.0–8.5. The analytical usefulness of the proposed electrode has been evaluated by its application in the determination of stannous in artificially made samples.

Zirconium(IV) phosphosulphosalicylate-based ion selective membrane electrode for potentiometric determination of Pb(II) ions

“…The development and application of ion-selective electrodes (ISEs) for sensitive and selective determination of polluting substances in different ecosystems have been subject of growing interest in recent years (Chandra et al, 2000;Wilson et al, 2010;Parra et al, 2011;Arida et al, 2010). The advantages of ISEs over many other methods are associated with easy handling, low cost, non-destructive analysis and ability to monitor concentration of ions without extensive sample preparation.…”