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

Bulletin of the Korean chemical society

M Aghaie¹  M Giahi¹  M Zawari¹ 

关键词: Mn+2-selective electrode;    PVC membrane N;    N'-bis(2'-pyridinecarboxamide)-1;    2-ethane;    Potentiometry;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown