Manganese(II) Ion-Selective Membrane Electrode Based on N-(2-picolinamido ethyl)-Picolinamide as Neutral Carrier

Abstract

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.

A Solid-Contact Ion Selective Electrode for Copper(II) Using a Succinimide Derivative as Ionophore

“…The response time is an important factor for an ion-selective electrode [39]. The dynamic response time was evaluated while changing the concentration of Cu(II) in solution over a concentration range from 10 −6 to 10 −2 mol·L −1 , by measuring the potentials with the automatic data acquisition system (Figure 4).…”

Fiber optic manganese ions sensor using SPR and nanocomposite of ZnO–polypyrrole

“…Membrane electrode based sensors that could sense Mn 2+ ions have been reported [16] but these sensors have a number of drawbacks. Firstly, general electrode based sensors cannot easily operate at room temperature.…”

Nano-level monitoring of Mn2+ ion by fabrication of coated pyrolytic graphite electrode based on isonicotinohydrazide derivatives

“…The literature survey reveals that a variety of ionophores have been used for the construction of Mn 2+ -selective electrodes [18][19][20][21][22][23][24][25][26][27][28]. However, they exhibit some limitations such as narrow working concentration range, low pH range, poor selectivity and high response time.…”