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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
Extraction: Advanced Methods00:56

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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 formed in...

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Related Experiment Video

Updated: Jun 27, 2026

A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
12:59

A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry

Published on: January 8, 2016

Mercury speciation by CE: an update.

Petr Kubán1, Pavlína Pelcová, Jana Margetínová

  • 1Department of Chemistry and Biochemistry, Mendel University of Agriculture and Forestry, Brno, Czech Republic. kuban0@mendelu.cz

Electrophoresis
|December 17, 2008
PubMed
Summary

This review updates on mercury speciation using capillary electrophoresis (CE). CE offers a fast, efficient method for analyzing mercury species in various samples, complementing chromatography.

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An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
09:33

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

Published on: December 17, 2018

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Last Updated: Jun 27, 2026

A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
12:59

A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry

Published on: January 8, 2016

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
09:33

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

Published on: December 17, 2018

Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Mercury species exhibit varying physicochemical properties, toxicity, and transformation pathways.
  • Accurate speciation of mercury is crucial for environmental monitoring and toxicological assessment.

Purpose of the Study:

  • To provide an updated review on mercury speciation analysis using capillary electrophoresis (CE).
  • To highlight recent advancements and trends in CE-based mercury speciation.
  • To discuss the application of CE in studying mercury interactions with biomolecules.

Main Methods:

  • Capillary Electrophoresis (CE) as a separation technique.
  • Sample preconcentration techniques: sample stacking, ion exchange, LLL extraction, dual-cloud point extraction.
  • Hyphenation of CE with element-specific detectors (ETAAS, AFS, ICP-OES, ICP-MS).

Main Results:

  • CE is presented as a complementary technique to chromatography, excelling in speed, efficiency, and low sample volume requirements.
  • Effective preconcentration strategies are essential for achieving low limits of detection (LODs) for trace mercury species.
  • Hyphenation with sensitive detectors enhances analytical capabilities for mercury speciation.

Conclusions:

  • Capillary electrophoresis is a powerful and versatile tool for mercury speciation.
  • CE facilitates the analysis of mercury species in complex matrices and interaction studies.
  • Advancements in preconcentration and detection methods continue to improve CE's applicability in mercury analysis.