Original scientific paper

Copper(II) ion selective PVC membrane electrode based on S,S'-bis(2-aminophenyl)ethanebis(thioate)

Marijo Buzuk ; Department of General and Inorganic Chemistry, Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
Slobodan Brinić ; Department of General and Inorganic Chemistry, Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
Eni Generalić ; Department of General and Inorganic Chemistry, Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia
Marija Bralić ; Department of General and Inorganic Chemistry, Faculty of Chemistry and Technology, University of Split, Teslina 10/V, 21000 Split, Croatia

Abstract

S,S'-bis(2-aminophenyl)ethanebis(thioate) (APhET) was synthesized and used as ion carrier in the preparation of copper(II) ion selective PVC membrane electrodes. The best performances were obtained by a membrane electrode with the composition: PVC as matrix (66 mg), APhET as ionophore (4 mg), o-NPOE as plasticizer (132 mg) and NaTBP as anionic additive (1/2 mole ratio in respect to APhET). This electrode exhibited a linear potential response to copper(II) in the concentration range 6.0 × 10−6 − 5.0 × 10−2 mol dm−3, with Nernstian slope of 29.5 mV/decade and detection limit down to 4 × 10−6 mol dm−3. It is suitable for copper(II) determination within pH between 4 and 7, and performs well over a period of 3 months. The electrode is selective for copper over a large number of metal ions, except Hg2+. No interference was noticed by chlorides and other examined anions. Described membrane electrode can be used in analytical measurements by direct potentiometry as well in potentiometric titration.

Keywords

copper(II); ISE; S,S'-bis(2-aminophenyl)ethanebis(thioate); polymer membrane electrodes; potentiometry

Hrčak ID:

45620

URI

https://hrcak.srce.hr/45620

Publication date:

20.12.2009.

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