PVC-membrane potentiometric sensors based on a recently synthesized Schiff base for Fe(III) ion

• Main Authors: S. Yousef Ebrahimipur, Ali Mostafavi, Tayebeh Shamspur, Iran Sheikhshoaie
• Format: Article
• Language: English
• Published: Chemical Society of Ethiopia 2012-12-01
• Series: Bulletin of the Chemical Society of Ethiopia
• Subjects: Iron; Ion selective electrode; PVC membrane; Schiff base; Potentiometry
• Online Access: http://www.ajol.info/index.php/bcse/article/view/72954

A potentiometric iron sensor based on the use 3-(2-diethylamino-ethylimino)-1,3-dihydro-indol-2-one (DEDIO) as an ionophore in poly(vinyl chloride) (PVC) matrix, is reported. The plasticized membrane sensor exhibits a Nernstian response for Fe(III) ions over a wide concentration range (2.0 × 10^-6 - 5.0 × 10^-2 M) with a super Nernstian slope of 26(plus or minus 1) mV per decade. It has a fast response time of less than 12 s and can be used for ten weeks without any considerable divergences in its potentials the electrode can be used in the pH range 4.5-8.0. The proposed sensor shows fairly good discriminating ability towards Fe(III) ion in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The sensor was used as indicator electrode in potentiometric titration of Fe(III) ions vs. EDTA.DOI: http://dx.doi.org/10.4314/bcse.v26i1.7