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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

Title	Manganese(II) Ion-Selective Membrane Electrode Based on N-(2-picolinamido ethyl)-Picolinamide as Neutral Carrier
Author	M Aghaie*, M Giahi, M Zawari
Keywords	Mn⁺²-selective electrode, PVC membrane N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane, Potentiometry
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/^oC. The stability constant (log K_s) 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.
Page	2980 - 2984
Full Text	PDF

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