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IJC-A Vol.47A(11) [November 2008] >


Title: Silver selective electrode based on liquid membrane containing N₂S₂O₂ macrocycle as ionophore
Authors: Mittal, Susheel K
Kumar, S K Ashok
Gupta, Nidhi Rani
Ocak, Mirac
Ocak, Ummuhan
Issue Date: Nov-2008
Publisher: CSIR
IPC CodeInt. Cl. ⁸ : G01N27/333
Abstract: Plasticized membrane using 5,6:17,18-dibenzo,11,12- (4-nitrobenzo)-2, 3-bis(hydroxyimine)-7,16-dithia-10, 13-dioxo-4, 19-diaazacyclooctadecane (N₂S₂O₂) based ionophore has been explored as Ag⁺ ion-selective sensor. Optimum performance is observed with membrane having composition of PVC, plasticizer and ionophore in the ratio of 33: 65: 2 (wt. %). Stability constants for different metal ions have been determined by conductometric titrations. The sensor works satisfactorily in the concentration range of 2.5×10⁻⁵ to 1.0×10⁻¹ M (detection limit 7.9×10⁻⁶ M) with a Nernstian slope of 58.5 mV/decade of activity. Wide pH range (5.0–9.0), fast response time (15 s), non-aqueous tolerance (up to 30%) and adequate shelf life (3 months) indicate the vital utility of the proposed sensor. The proposed electrode shows good selectivity for Ag⁺ ion with respect to alkali, alkaline earth, transition and rare earth metal ions and can be used for its determination in binary mixtures. Determination of chloride contents in samples of Vitamin B1 and tap water has also been made by using the proposed electrode.
Page(s): 1676-1680
ISSN: 0376-4710
Source:IJC-A Vol.47A(11) [November 2008]

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