Flow injection amperometry as an alternative to potentiometry for solid contact ion-selective membrane-based electrodes.

Amperometric Ion-Selective Electrodes Based on Prussian Blue Nanoparticles

“…The current response is linearly dependent on the concentration of potassium chloride in the range from 2.5 × 10 −5 to 1 × 10 −3 M (Figure 3). As a result of coating the PB nanoparticles with the ISM, the sensitivity in Bis-Tris becomes equal to 3.6 ± 0.4 mA•M −1 •cm −2 , which is comparable to a sensor based on PEDOT(PSS) [5]. A separate solution method was used to find the selectivity coefficient logK Na + /K + = −2.7.…”

“…The peak current increases with the increase in the concentration of potassium chloride. Previously, for SC-ISEs based on conductive polymers (polyaniline, PEDOT), it was shown that the first peak is the analytical signal [4,5]. Hence, the sensor sensitivity was estimated from the plot of the cathodic current peak versus the concentration of potassium chloride.…”

“…Previously, we have proposed a fundamentally new approach, alternative to classical potentiometry [4,5], which consists in registration of the current response at a constant potential in the flow-injection amperometry mode. This approach eliminates the limitations of potentiometric SC-ISE such as baseline drift and potential instability.…”

Ionophore-Based Ion-Selective Electrodes in Non-Zero Current Modes: Mechanistic Studies and the Possibilities of the Analytical Application

“…Rigorously speaking, these data do not refer to ionophore-based membranes. However, promising results were obtained also with K +selective and Na + -selective ISEs (glassy carbon/PEDOT-PSS/PVC membrane) in flow injection amperometric measurements at a constant potential [85].…”

Desenvolvimento de (bio)sensores (nano)estruturados visando a determinação de analitos em amostras farmacêuticas e fluidos biológicos

“…A demanda por análises mais rápidas, precisas e de menor custo, tem levado ao desenvolvimento de processos mecanizados ou automatizados. Sistemas em fluxo, como o FIA, se constituem em um campo fértil para estes desenvolvimentos [81].…”