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Related Concept Videos

Dialysis01:15

Dialysis

2.3K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

3.1K
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...
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Ion Exchange01:17

Ion Exchange

1.6K
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...
1.6K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
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...
1.3K
Electrodeposition01:08

Electrodeposition

2.6K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
2.6K
Masking and Demasking Agents01:19

Masking and Demasking Agents

4.1K
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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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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Electrodialytic matrix isolation for metal cations.

Shin-Ichi Ohira1, Yuri Hiroyama1, Koretaka Nakamura1

  • 1Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.

Talanta
|December 6, 2014
PubMed
Summary

Electrodialytic ion transfer offers a novel matrix isolation method for heavy metal analysis. This technique efficiently transfers metal ions from samples, improving determination accuracy and reproducibility.

Keywords:
Heavy metalsIon transfer deviceMatrix isolationSerum

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Electrochemistry

Background:

  • Matrix isolation is crucial for accurate heavy metal determination.
  • Conventional methods like acid digestion can be time-consuming and may introduce contaminants.
  • Developing efficient and reproducible pre-concentration techniques is essential for trace metal analysis.

Purpose of the Study:

  • To investigate electrodialytic ion transfer as a matrix isolation tool for heavy metal analysis.
  • To optimize the ion transfer device (ITD) parameters for quantitative heavy metal cation transfer.
  • To evaluate the performance of the ITD for heavy metal determination in biological samples.

Main Methods:

  • Utilized an ion transfer device (ITD) for electrodialytic transfer of heavy metal cations.
  • Optimized parameters included flow rates, applied voltage, and receptor composition.
  • Investigated the effects of sample pH and salt concentration (NaCl) on transfer efficiency.
  • Applied the optimized ITD method to determine Fe, Cu, and Zn in serum samples.

Main Results:

  • Quantitative transfer of heavy metal ions was achieved across a wide concentration range (µg L⁻¹ to mg L⁻¹).
  • Transfer efficiency was independent of acidic sample pH but decreased with increasing NaCl concentrations (>1 mM).
  • Transient sample introduction effectively ameliorated the negative effect of NaCl up to 5 mM.
  • The ITD method demonstrated superior reproducibility compared to conventional digestion methods for serum analysis.

Conclusions:

  • Electrodialytic ion transfer is a viable and effective matrix isolation technique for heavy metal determination.
  • The ITD method offers a reproducible and potentially faster alternative to traditional sample preparation techniques.
  • This approach shows promise for the analysis of heavy metals in complex biological matrices like serum.