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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

516
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...
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Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
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Ion Exchange01:17

Ion Exchange

642
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...
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Efficient and selective solid-phase microextraction of polychlorinated biphenyls by using a three-dimensional

Feifei Lu1, Mengqin Wu2, Chenchen Lin2

  • 1Institute of Food Safety and Environment Monitoring, Fuzhou University, Qi Shan Campus, 2 Xue Yuan Road,U., Fuzhou 350108, China; Fujian Key Laboratory of Quality and Safety of Agri-Products, Institute of Agricultural Quality Standards and testing Technology Research, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China.

Journal of Chromatography. A
|August 31, 2022
PubMed
Summary

Novel covalent organic frameworks (COFs) offer selective solid phase microextraction (SPME) for trace pollutants. The developed 3D TpTAM-COF fiber shows high selectivity and efficiency for polychlorinated biphenyls (PCBs) in environmental samples.

Keywords:
3D covalent organic frameworkFiber coatingPolychlorinated biphenylsSelective solid phase microextraction

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Selective solid phase microextraction (SPME) is crucial for analyzing trace pollutants.
  • Developing advanced materials for efficient pollutant capture remains a challenge.

Purpose of the Study:

  • To design and synthesize novel 3D covalent organic frameworks (COFs) for selective SPME of polychlorinated biphenyls (PCBs).
  • To evaluate the performance of the developed COF-based SPME fiber for environmental sample analysis.

Main Methods:

  • Synthesis of 3D TpTAM-COF using tetra (p-aminophenyl) methane (TAM) and 1,3,5-triformylphloroglucinol (Tp) monomers.
  • Characterization of the synthesized COF using techniques like XPS, XRD, and thermal analysis.
  • Application of the COF-coated fiber in headspace solid phase microextraction (HS-SPME) coupled with Gas Chromatography-Mass Spectrometry (GC-MS).

Main Results:

  • The synthesized 3D TpTAM-COF exhibited high specific surface area, thermal stability, and spatial selectivity.
  • The COF-based SPME fiber demonstrated superior adsorption affinity and selectivity towards PCBs over other organic compounds.
  • Highest enhancement factor (EF) reached 10305 for PCBs, with high recoveries (84.8–117.2%) in river water and soil samples.

Conclusions:

  • The novel 3D TpTAM-COF material provides a promising platform for selective SPME of trace PCBs.
  • The developed COF-based SPME fiber outperforms commercial alternatives in selectivity and efficiency.
  • This approach offers a viable method for sensitive and selective environmental monitoring of PCBs.