Voltammetric determination of thallium(I) on a prussian blue/cinder paste electrode

Abstract

The effective utilization of industrially waste cinder for electroanalytical applications by trapping the hexacyanometallate (HCF) units from Fe³⁺, Ni²⁺, Co^3+, etc into the interlayer galleries of cinder has been reported. Prussian blue (PB ) is an Fe( III )-HCF with mixed valence and zeolite type properties. In the present investigation, the intercalation property of TI⁺ with PB/cinder paste electrode (designated as PBCPE) has been utilized for the analytical purpose. Basic cyclic voltammetric experiments with TI⁺ in 0.1 <i>M </i>KNO₃results in a continuous insertion of TI⁺ ions inside the PB gallery with the ejection of K⁺ ions. The insertion rate of TI⁺ ions in the PBCPE was much faster as compared to that in traditional PB modified electrodes. The PBCPE has also been utilized for sensitive determination of TI⁺ ions in real samples.