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Related Concept Videos

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
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Precipitation and Co-precipitation01:17

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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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Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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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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Related Experiment Video

Updated: Mar 8, 2026

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
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TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples

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Chemical tools for detecting Fe ions.

Tasuku Hirayama1, Hideko Nagasawa1

  • 1Laboratory of Pharmaceutical and Medicinal Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan.

Journal of Clinical Biochemistry and Nutrition
|February 7, 2017
PubMed
Summary

Labile iron, crucial for physiological functions, can cause cellular damage when dysregulated. This review details chemical tools for monitoring iron's redox states in biological systems to understand its role in disease.

Keywords:
chromogenic probefluorescenct probeimagingiron

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Chemical Biology

Background:

  • Iron's multiple oxidation states enable vital physiological roles like respiration and enzymatic reactions.
  • Dysfunctional iron regulation leads to overload, causing cellular damage via reactive oxygen species.
  • Labile iron, unbound or weakly bound, is implicated in various pathological processes.

Purpose of the Study:

  • To review chemical tools for monitoring iron.
  • To elucidate the variation of labile iron in pathological processes.
  • To present chemical tools applicable to biological studies for detecting iron species.

Main Methods:

  • Review of classical chromogenic and novel chemical tools for iron detection.
  • Focus on methods distinguishing between different iron redox states (Fe2+ and Fe3+).
  • Emphasis on tools suitable for biological sample analysis.

Main Results:

  • Iron's electrochemical properties are key to its biological functions and pathological roles.
  • Labile iron contributes to aberrant reactive oxygen species production.
  • Separate detection of Fe2+ and Fe3+ is crucial for detailed physiological and pathological understanding.

Conclusions:

  • Chemical tools are essential for investigating labile iron dynamics in biological systems.
  • Understanding iron's redox states is critical for elucidating its role in health and disease.
  • This review provides a comprehensive overview of chemical detection methods for biological iron species.