Fabrication of a new samarium(III) ion-selective electrode based on 3-{[2-oxo-1(2H)-acenaphthylenyliden]amino}-2-thioxo-1,3-thiazolidin-4-one

Abstract

This paper introduces the development of an original PVC membrane electrode, based on 3-{[2-oxo-1(2H)-acenaphthylenyliden]amino}-2-thioxo-1,3- thiazolidin-4-one (ATTO) which has revealed to be a suitable carrier for Sm 3+ ions. The resulting data illustrated that the electrode shows a Nernstian slope of 19.3 ± 0.6 mV per decade for Sm3+ ions over a broad working concentration range of 1.0 × 10-6 to 1.0 × 10-1 mol L-1. The lower detection limit was found to be equal to (5.5± 0.3) × 10-7 mol L-1 in the pH range of 3.5-7.5, and the response time was very short (∼10 s). The potentiometric sensor displayed good selectivities for a number of cations such as alkali, alkaline earth, transition and heavy metal ions. ©2007 Sociedade Brasileira de Química.