在固体接触离子选择电极中非平衡离子检测
Ryan C Gettler1, Shima Mehregan2, Henry D Koenig2
1Chemical and Biomedical Engineering, University of Missouri, Columbia, Missouri 65211, United States.
ACS omega
|April 15, 2024
概括
使用恒定电流运行的新传感器克服了传统离子选择电极 (ISE) 检测酸盐和酸盐的局限性. 这一进步使得低成本,便携式的营养监测能够改善农业和环境保护.
科学领域:
- 电化学 电化学 电化学
- 传感器技术 传感器技术
- 环境监测 环境监测
背景情况:
- 现有的酸盐和酸盐离子选择性电极 (ISE) 是昂贵的,并且存在性能问题,例如长平衡时间和选择性差.
- 改进的,低成本的传感器对于高效的农业和减轻水道中的营养污染至关重要.
研究的目的:
- 开发使用离子选择性电极 (ISE) 技术的便宜,便携式酸盐和酸盐传感器.
- 通过新的操作模式和材料克服传统的基于离子体的IEE的局限性.
主要方法:
- 研究了基于离子体的阳离子选择性ISE的恒流运行,重点是离子流动性而不是结合热力学.
- 在应用电流下开发了相位边界潜力和离子扩散的理论模型.
- 用分子印记聚合物 (MIP) 进行实证的脉冲电流操作,用于固体接触ISE.
主要成果:
- 通过利用离子流动性差异,恒流操作提高了ISE性能.
- 脉冲电流的运行使得在固体接触ISE中使用更低成本的MIP成为可能.
- 基于MIP的传感器显示出与普通离子相比具有竞争性的选择性,与基于离子体的传感器相比或超过.
结论:
- 恒定电流和脉冲电流运行为ISE提供了一个新的范式,克服了传统设计的局限性.
- 微型隐形图片是可行的,成本效益高的材料,用于开发选择性固体接触ISE.
- 这项工作为下一代ISE传感器开发提供了理论框架和实践演示.
相关概念视频
Potentiometry: Membrane Electrodes
568
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
568
Ion-Exchange Chromatography
458
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
458
Ion Exchange
591
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
591
Interfacial Electrochemical Methods: Overview
240
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
240
Potentiometry: Types of Electrodes
639
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
639
Controlled-Potential Coulometry: Electrolytic Methods
161
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
The chosen potential...
161


