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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Natural deep eutectic solvent-based microextraction for mercury speciation in water samples.

Laura Ripoll1, Javier Rayos1, Miguel Ángel Aguirre1

  • 1Departamento de Química Analítica, Nutrición y Bromatología e Instituto Universitario de Materiales, Universidad de Alicante, P.O. Box 99, Alicante, 03080, Spain.

Analytical and Bioanalytical Chemistry
|March 5, 2023
PubMed
Summary

A new eco-friendly analytical method uses natural deep eutectic solvents (NADES) for mercury speciation in water. This technique offers sensitive detection and reliable quantification of mercury species in various water samples.

Keywords:
Environmental samplesGreen analytical chemistryMercury speciationMicroextractionNatural deep eutectic solvent

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Area of Science:

  • Analytical Chemistry
  • Environmental Chemistry
  • Green Chemistry

Background:

  • Mercury speciation is crucial for environmental monitoring due to mercury's toxicity.
  • Traditional methods for mercury analysis often involve hazardous solvents and complex procedures.
  • Developing greener analytical techniques is essential for sustainable environmental science.

Purpose of the Study:

  • To develop and validate a novel, environmentally friendly analytical method for mercury speciation in water samples.
  • To utilize a natural deep eutectic solvent (NADES) for efficient separation and preconcentration of mercury species.
  • To assess the method's performance, including sensitivity, precision, accuracy, and greenness.

Main Methods:

  • A natural deep eutectic solvent (NADES) composed of decanoic acid and DL-menthol (1:2 molar ratio) was employed as an extractant.
  • Dispersive liquid-liquid microextraction (DLLME) was utilized for the separation and preconcentration of mercury species.
  • Liquid chromatography coupled with UV-Vis detection (LC-UV-Vis) was used for mercury speciation analysis.

Main Results:

  • The optimized method achieved low limits of detection (0.9 µg L⁻¹ for organomercurial species, 3 µg L⁻¹ for Hg²⁺).
  • Good precision was observed with relative standard deviations (RSD) ranging from 6-12% at tested concentrations.
  • The method demonstrated acceptable trueness in real water samples, with recoveries between 75-118%, although wastewater samples showed matrix effects.

Conclusions:

  • The developed NADES-based DLLME method is a promising, green alternative for mercury speciation in water.
  • The method offers good sensitivity and reliability for environmental water analysis.
  • Further investigation may be needed to mitigate matrix effects in complex samples like wastewater.