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相关概念视频

Ion Exchange01:17

Ion Exchange

520
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...
520
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

398
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...
398
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

474
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...
474
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

398
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
398
Masking and Demasking Agents01:19

Masking and Demasking Agents

2.3K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Formation of Complex Ions03:45

Formation of Complex Ions

23.1K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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相关实验视频

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Dynamic Electrochemical Measurement of Chloride Ions
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溶液可处理的全固态化物选择性电极:从离子剂交换增强的灵敏度.

Shi Hoe Ng1, Georgina E K K Seah1, Dorsasadat Safanama1

  • 1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A∗STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.

Analytica chimica acta
|February 28, 2025
PubMed
概括

研究人员开发了一种可处理溶液的固体接触离子选择电极 (SC-ISE) 用于化物传感. 离子交换提高了灵敏度和选择性,使得医疗保健和可扩展的离子选择性SC-ISE制造中的应用成为可能.

关键词:
化物 化物导电聚合物的导电聚合物.离子传感器是一个离子传感器.离子选择性电极 离子选择性电极固体接触 接触 固体接触转导层是一个转导层.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 分析化学 分析化学

背景情况:

  • 离子选择性电极 (ISE) 在各种行业中至关重要.
  • ISEs的小型化包括用固体接触物 (SC-ISEs) 取代液体电解质.
  • 解决方案处理是SC-ISE制造的首选,但由于固体接触兼容性差,对阴离子SC-ISE存在挑战.

研究的目的:

  • 开发一种完全可处理溶液的固体接触器,用于离子ISEs.
  • 使用一种新离子交换方法制造化物 (Cl-) SC-ISE.
  • 调查固体接触修改对SC-ISE性能的影响.

主要方法:

  • 通过离子交换制造一个聚-3,4-乙烯二氧化) -聚乙烯甘醇 (PEDOT-PEG) 固体接触剂.
  • 离子选择性膜 (ISM) 的滴滴造到经过修改的固体接触.
  • 电化学表征包括灵敏度,选择性和动态范围评估.
  • 在合成和真实生物样本 (汗水,尿液,血液) 中进行测试.

主要成果:

  • 固体接触PEDOT-PEG的离子交换显著提高了SC-ISE的灵敏度.
  • 最佳的SC-ISE对化物表现出接近Nernstian的反应 (-53.3 ± 0.5 mV/十年).
  • 该SC-ISE显示出对常见干扰离子和生物样品稳定性的优良选择性.
  • 在合成和真人汗水,尿液和血液样本中检测化物的成功应用.

结论:

  • 为可处理溶液的固体接触物开发了一种简单,可扩展和有效的离子交换协议.
  • 这种方法克服了离子SC-ISE制造的局限性,显著提高了性能.
  • 开发的SC-ISE显示出对现实世界应用的希望,特别是在医疗监测中.
  • 该协议可以扩展到可扩展的各种离子选择性SC-ISEs的制备.