The Influence of the Conditioning Procedure on Potentiometric Characteristics of Solid Contact Calcium‐Selective Electrodes in Nanomolar Concentration Solutions

Abstract

A solid contact calcium-selective electrode with a poly(pyrrole) intermediate layer doped with the calcium ioncomplexing ligand Tiron was successfully constructed and examined towards the possibility of lowering the detection limit. Two calcium ionophores, ETH 1001 and ETH 129, were compared. A variety of different shapes of potentiometric responses can be obtained in a controlled manner by applying an appropriate conditioning procedure. The lifetime of the investigated electrodes was longer than 1 year. The modified poly(pyrrole) solid contact electrode was compared with the coated wire type. An inductively coupled plasma mass spectrometry with laser ablation analysis (LA ICP MS) was used to confirm the transmembrane ion fluxes.

A highly selective lead-sensitive electrode with solid contact based on ionic liquid

“…It was demonstrated that in the case of solid contact electrodes their conditioning procedure affects both the detection limit and selectivity coefficients [27,28]. The effect of conditioning solution on the electrode response is shown in Fig.…”

A Comparative Study of Cadmium Ion‐Selective Electrodes with Solid and Liquid Inner Contact

“…It was demonstrated that in the case of solid contact electrodes their conditioning procedure affects both the detection limit and selectivity coefficients [29,30]. The effect of conditioning the solution on the response of ISE 3E is shown in Figure 3, where can it be seen that conditioning the electrode in solution containing low activity of Cd 2 + ions has a beneficial effect on its response.…”

Highly Selective Amide-tethered 4-aminoquinoline-β-lactam Based Electrochemical Sensors for Zn (II) ion Recognition

“…No significant potential perturbation has been observed with these metal ions as their obtained slopes are far from Nernstian behavior. It is well known that different conditioning solution and the starting solution strongly affect the detection limits of SC-ISEs [45,46]. To investigate these effects, the calibration curves of the CGE-1 were noted by testing the conditioning protocols such as: 1 day in 10 À3 M Zn (NO 3 ) 2 followed by 2 days in 10 À5 M Zn (NO 3 ) 2 (protocol 1), 1 day in 10 À3 M Zn (NO 3 ) 2 followed by 2 days in 10 À8 M Zn (NO 3 ) 2 (protocol 2), 1 day in 10 À6 M Zn (NO 3 ) 2 followed by 2 days in 10 À8 M Zn (NO 3 ) 2 (protocol 3) and the best lower detection limit (8.26 Â 10 À8 M) is achieved by employing protocol 2 as shown in curve B of Fig.…”