Thiocyanate ion selective electrode based on bis(N-3-methylphenyl salicylidenaminato)copper(II) ionophore

In this work a PVC membrane electrode based on bis(N-3-methyl phenyl salicylidenaminato)copper(II) as ionophore was prepared. The electrode was tested by inorganic anions and showed good selectivity for thiocyanate ion. This sensor showed Nerstian behavior with a slope of a −59.3 mV per decade at 25 °C. The proposed electrode exhibited a wide linear range from 1.0 × 10−6 mol/L to 1.0 × 10−1 mol/L with a detection limit of 5.0 × 10–7 mol/L. The electrode response was independent of pH in the range of 4.0–10.0. The response time is about 9–21 s, and the electrode can be used for over 60 days without considerable deterioration. The prepared sensor was applied as an indicator electrode in potentiometric titration of SCN− with Ag+ ion and to determine the thiocyanate in samples of urine and saliva.

Graphical abstractA thiocyanate ion selective electrode was prepared. The electrode showed a good selectivity and sensitivity, wide dynamic range, low detection limit, fast response time and applicable for analytical samples.Figure optionsDownload full-size imageDownload as PowerPoint slide