Solid-contact Cu(II) ion-selective electrode based on 1,2-di-(o-salicylaldiminophenylthio)ethane

Abstract

The development of Cu(II) solid-contact ionselective electrodes, based on 1,2-di-(o-salicylaldiminophenylthio)ethane as a neutral carrier, is presented. For the electrodes construction, unmodified carbon ink (type 1 electrode) and polymer membrane-modified carbon ink (type 2 electrode) were used as solid support and transducer layer. Also, carbon ink composite polymer membrane electrode (type 3 electrode) was prepared. The analytical performance of the electrodes was evaluated with potentiometry, while bulk and interfacial electrode features were provided with electrochemical impedance spectroscopy. It is shown that modification of carbon ink with polymer membrane cocktail decreases the bulk contact resistance of the transducer layer and polymer membrane, thus enhancing the analytical performance of the electrode in terms of sensitivity, linear range, and stability of potential. The optimized electrodes of types 2 and 3 exhibit a wide linear range with detection limits of 1.8×10 −6 and 1.6×10 −6 M, respectively. They are suitable for determination of Cu 2+ in analytical measurements by direct potentiometry and in potentiometric titrations, within pH between 2.3 and 6.5. The electrodes are selective for Cu 2+ over a large number of tested transition and heavy metal ions.

Single-Piece Solid Contact Cu2+-Selective Electrodes Based on a Synthesized Macrocyclic Calix[4]arene Derivative as a Neutral Carrier Ionophore

“…To explore the novelty of this work, comparison of the proposed sensors with other solid-contact Cu 2+ -ISEs previously reported is also given in Table 5 . The table clearly indicated good enhancement in the behavior of the proposed copper electrode in terms of the detection limit and linear range [ 33 , 35 , 36 , 37 , 41 , 42 , 43 , 44 ], slope [ 34 , 44 ] and selectivity [ 33 , 34 , 42 ].…”

Znanstveno-istraživačka djelatnost Zavoda za opću i anorgansku kemiju u razdoblju 2010. – 2020.

“…Ta je molekula inkorporirana u "tekuću" PVC matricu te testirana kao ionofora u mokrofaznoj izvedbi potenciometrijskog senzora. 22 Razvijeni potenciometrijski senzor bio je selektivan na bakrove(II) katione u prisutnosti drugih metalnih kationa, osim živinih(II) kationa. Pripravljeni senzor uspješno je primijenjen u potenciometrijskim titracijama.…”

“…Kao ionsko-selektivna "tekuća" membrana poslužila je ona temeljna na 1,2-di-(o-salicilaldiminofeniltio)etanu. 24 Razvoj ionsko-selektivnih elektroda, temeljenih na kristalnim membranama, u svrhu potenciometrijskog određivanja bakrovih(II) kationa, temeljio se na sintezi različitih srebro-bakrovih sulfida. 25 Promjenom uvjeta pri pripravi tih anorganskih materijala sutaloženjem metalnih soli i natrijeva sulfida, sintetizirana su tri ternarna sulfida različitog sastava.…”