scholarly journals Evidence of a water layer in solid-contact polymeric ion sensors

2008 ◽  
Vol 10 (1) ◽  
pp. 73-76 ◽  
Author(s):  
Roland De Marco ◽  
Jean-Pierre Veder ◽  
Graeme Clarke ◽  
Andrew Nelson ◽  
Kathryn Prince ◽  
...  
Keyword(s):  
Water Layer ◽  
Solid Contact ◽  
Ion Sensors

Solid-Contact pH Sensor without CO2Interference with a Superhydrophobic PEDOT-C14as Solid Contact: The Ultimate “Water Layer” Test

2017 ◽  
Vol 89 (16) ◽  
pp. 8468-8475 ◽  
Author(s):  
Marcin Guzinski ◽  
Jennifer M. Jarvis ◽  
Paul D’Orazio ◽  
Anahita Izadyar ◽  
Bradford D. Pendley ◽  
...  
Keyword(s):  
Ph Sensor ◽  
Water Layer ◽  
Solid Contact

Development of a Graphene Paper-Based Flexible Solid-Contact Lead Ion-Selective Electrode and its Application in Water

2019 ◽  
Vol 62 (2) ◽  
pp. 245-252 ◽  
Author(s):  
Yao Yao ◽  
Yibin Ying ◽  
Jianfeng Ping
Keyword(s):  
Metal Ion ◽  
Water Layer ◽  
Potentiometric Sensor ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Solid Contact ◽  
Selective Electrode ◽  
Filtration Method ◽  
Selective Membrane ◽  
Graphene Paper

Abstract. A graphene paper-based flexible solid-contact ion-selective electrode (SC-ISE) was developed to detect lead ion sensitively. Graphene paper obtained via a simple vacuum filtration method was used as the electrode substrate for direct coating of an ion-selective membrane. The Nernstian slope of the prepared paper-based potentiometric sensor toward lead ion detection was demonstrated as 29.4 mV per decade. A detection limit as low as 2.5 × 10-7 mol L-1 was achieved. Reversed chronopotentiometry and water layer test revealed that the graphene paper-based SC-ISE possessed excellent potential stability because of the hydrophobicity of graphene paper. Furthermore, reliable data were obtained from the detection of lead ion levels in real water samples using the graphene paper-based potentiometric sensor, which shows great potential in practical application. Keywords: Graphene paper, Heavy metal, Ion-selective electrode, Potentiometry, Water sample.

Evaluation, Pitfalls and Recommendations for the “Water Layer Test” for Solid Contact Ion‐selective Electrodes

2019 ◽  
Vol 32 (4) ◽  
pp. 781-791 ◽  
Author(s):  
Bradley Hambly ◽  
Marcin Guzinski ◽  
Bradford Pendley ◽  
Ernő Lindner
Keyword(s):  
Water Layer ◽  
Ion Selective Electrodes ◽  
Solid Contact

scholarly journals Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 259
Author(s):  
Nikola Lenar ◽  
Robert Piech ◽  
Jan Wyrwa ◽  
Beata Paczosa-Bator
Keyword(s):  
Electrochemical Impedance ◽  
Light Exposure ◽  
Water Film ◽  
Water Layer ◽  
Linear Range ◽  
Solid Contact ◽  
Iridium Dioxide ◽  
Potentiometric Response ◽  
Coated Disc ◽  
Selective Membrane

This work presents new material for solid-contact layers—hydrous iridium dioxide IrO2·2H2O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remarkable electrical parameters of layers resulted in great analytical parameters of IrO2·2H2O-contacted potassium-selective electrodes. Various parameters of ion-selective electrodes were examined in the scope of this work using a potentiometry method including: linear range, repeatability, stability of potentiometric response and sensitivity to varying measurement conditions. The analytical parameters obtained for solid-contact electrodes were compared with the ones obtained for coated disc electrodes to evaluate the influence of the iridium dioxide layer. The linear range of the IrO2·2H2O-contacted K+-selective electrodes covered concentrations of K+ ions from 10−6 to 10−1 M and the potential stability was estimated at 0.097 mV/h. The IrO2·2H2O-contacted electrodes turned out to be insensitive to varying light exposure and changes in the pH values of measured solutions (in the pH range of 2 to 10.5). A water layer test proved that, contrary to the coated disc electrode, the substantial water film is not formed between the ion-selective membrane and iridium dioxide layer.

scholarly journals Synthesis and characterization of high-integrity solid-contact polymeric ion sensors

2008 ◽  
Vol 13 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Roland De Marco ◽  
Elaine Jee ◽  
Kathryn Prince ◽  
Ernö Pretsch ◽  
Eric Bakker
Keyword(s):  
Synthesis And Characterization ◽  
Solid Contact ◽  
Ion Sensors ◽  
High Integrity

scholarly journals Solid-Contact Potentiometric Anion Sensing Based on Classic Silver/Silver Insoluble Salts Electrodes without Ion-Selective Membrane

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 959
Author(s):  
Chunxian Liao ◽  
Lijie Zhong ◽  
Yitian Tang ◽  
Zhonghui Sun ◽  
Kanglong Lin ◽  
...  
Keyword(s):  
Polymeric Membrane ◽  
Solid Contact ◽  
Ion Sensors ◽  
Anion Sensing ◽  
Metal Metal ◽  
Selective Membrane ◽  
Organic Chloride ◽  
Silver Silver ◽  
Potentiometric Ion Sensors ◽  
Insoluble Salt

Current solid potentiometric ion sensors mostly rely on polymeric-membrane-based, solid-contact, ion-selective electrodes (SC-ISEs). However, anion sensing has been a challenge with respect to cations due to the rareness of anion ionophores. Classic metal/metal insoluble salt electrodes (such as Ag/AgCl) without an ion-selective membrane (ISM) offer an alternative. In this work, we first compared the two types of SC-ISEs of Cl− with/without the ISM. It is found that the ISM-free Ag/AgCl electrode discloses a comparable selectivity regarding organic chloride ionophores. Additionally, the electrode exhibits better comprehensive performances (stability, reproducibility, and anti-interference ability) than the ISM-based SC-ISE. In addition to Cl−, other Ag/AgX electrodes also work toward single and multi-valent anions sensing. Finally, a flexible Cl− sensor was fabricated for on-body monitoring the concentration of sweat Cl− to illustrate a proof-of-concept application in wearable anion sensors. This work re-emphasizes the ISM-free SC-ISEs for solid anion sensing.

Sign in / Sign up

Export Citation Format

Share Document