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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 10
BKCSDE 31(10)
October 20, 2010 

Manganese(II) Ion-Selective Membrane Electrode Based on N-(2-picolinamido ethyl)-Picolinamide as Neutral Carrier
M Aghaie*, M Giahi, M Zawari
Mn+2-selective electrode, PVC membrane N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane, Potentiometry
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/oC. The stability constant (log Ks) of the Mn+2 - bpenH2 complex was determined at 25 oC by potentiometric titration in mixed aqueous solution. The proposed electrode was applied to the determination of Mn+2 ions in real samples.
2980 - 2984
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