Transient signals with an Antimony(V) ion-selective electrode: The relative signal return rate as a selectivity parameter

• Published in: Talanta (Oxford) Vol. 41; no. 4; pp. 627 - 630
• Main Authors: Ortuño, Joaquin A., Sánchez-Pedreño, Conceptión, de Bobadilla, Rocio Fernandez
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.1994; Oxford Elsevier
• Subjects: Chemistry; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Ion selective electrodes; Ion selective electrode; Dynamic response; Membrane electrode; Hexachloroantimonates; Ionophore; Polyvinyl chloride; Experimental study; Electrochemical reaction; Chlorides Compounds; Flow injection
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/0039-9140(93)E0016-7

The dynamic response of a Sb 5+ ion-selective electrode based on 1,2,4,6-tetraphenylpyridinium hexachloroantimonate(V) to different ions, ClO − 4, HgCl3 − 3, AuCl − 4,TlCl − 4, SbCl − 6 and tetraphenylborate, in a flow-injection analysis system using a flow-through cell, is studied. The transient signals obtained are different for every ion. A parameter called relative return rate, defined as the ratio of the return rate to peak height, was found to be characteristic for each ion. It was constant up to a concentration range of three decades for those ions with selectivity coefficients K pot sb, j ⪡ 1, thus providing a new source of analytical selectivity. Flow injection variables were studied in order to ascertain their influence on this new parameter.