A new poly (vinyl chloride) (PVC) membrane electrode that is highly selective to Mn +2 ions was prepared using N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane (bpenH2) as a suitable neutral carrier. This concentration range (1.0 × 10 -5 to 1.0 × 10 -1 M) with Nernstian slope of 29.3 ± 0.5 mV per decade. The detection limit and the response time of electrode were 8.0 × 10 -6 M and (≤ 15 s) respectively. The membrane can be used for more than two months without observing any divergence. The electrodes exhibited excellent selectivity for Mn +2 ion over other mono-, di-and trivalent cations. Selectivity coefficients were determined by the matched potential method (MPM). The electrode can be used in the pH range from 4.0 -9.0. The isothermal coefficient of this electrode amounted to 0.00023 V/ o C. The stability constant (log Ks) of the Mn +2 -bpenH2 complex was determined at 25 o C by potentiometric titration in mixed aqueous solution. The proposed electrode was applied to the determination of Mn +2 ions in real samples.
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