A New Cesium Ion Selective Graphite Rod Electrode Based on Cs‐Molybdophosphate

ABSTRACT

A new poly(vinyl chloride) (PVC) electrode for Cs⁺ ion based on Cs‐12‐molybdophosphate (Cs‐12‐MPO) as a membrane carrier is prepared and characterized. The electrode exhibits a linear response with slope of 46.5 ± 1 mV/decade within the concentration range of 1.0 × 10⁻⁵–1.0 × 10⁻¹ mol L⁻¹ Cs⁺ ion. The limit of detection was 3.0 × 10⁻⁶ mol L⁻¹. The proposed electrode shows a good selectivity for Cs⁺ ion over a wide variety of other metal ions and could be used in the pH range of 4.0–6.0. It has a relatively fast response time less than (30 s) and can be used for at least three weeks without any considerable divergence in potentials. The proposed electrode is applied as a sensor for the determination of Cs⁺ ion concentration in some samples. The results show a good correlation with the data obtained by atomic absorption spectrometric method. The average recovery obtained is 92 ± 0.5% with a standard deviation of 1.2%.

Keywords:

• Cesium selective electrode
• Cs‐12‐molybdophosphate
• Coated graphite rod
• Potentiometric determination

Notes

^aAtomic absorption spectrometric standard method.

^bThe developed ion selective electrode.