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Complexometric Titration: Overview00:39

Complexometric Titration: Overview

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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Complexometric Titration: Ligands00:43

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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 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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Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

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EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p function) as a function of the volume of EDTA added. This curve consists of three regions: before, at, and after equivalence points. Excess free metal ions are present before the equivalence point. Equal concentrations of metal ions and EDTA are present at the equivalence point. After the equivalence point, excess EDTA exists. This means slight...
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Indicators02:39

Indicators

51.6K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Colorimetric recognition of lanthanide ions with a complexometric indicator array.

Tiantian Zhang1, Xiuzhi Zhuo1, Guoyue Shi1

  • 1School of Chemistry and Molecular Engineering, Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, Shanghai Key Laboratory of Multidimensional Information Processing, Engineering Research Centre for Nanophotonics and Advanced Instrument (Ministry of Education), East China Normal University, 500 Dongchuan Road, Shanghai 200241, China. mzhang@chem.ecnu.edu.cn.

The Analyst
|June 17, 2021
PubMed
Summary

This study introduces a novel colorimetric sensor array for identifying lanthanide ions. The array effectively distinguishes fourteen different lanthanide ions using complexometric indicators and absorbance measurements.

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Lanthanide ions play crucial roles in various scientific and industrial applications.
  • Accurate detection and differentiation of lanthanide ions are essential for environmental monitoring and chemical analysis.
  • Existing methods for lanthanide ion detection can be complex and lack specificity.

Purpose of the Study:

  • To develop a novel colorimetric sensor array for the pattern recognition and differentiation of lanthanide ions.
  • To utilize complexometric indicators for chromogenic reactions with lanthanide ions.
  • To explore the potential of the sensor array for distinguishing different concentrations and mixtures of lanthanide ions.

Main Methods:

  • A colorimetric sensor array was designed using complexometric indicators (Alizarin Red and Erichrome Black T).
  • Chromogenic reactions were performed in Tris-HCl buffer at two different pH levels (7.4 and 8.5).
  • Absorbance responses of fourteen lanthanide ions were measured and analyzed for pattern recognition.

Main Results:

  • The developed sensor array successfully distinguished between fourteen different lanthanide ions based on their unique absorbance patterns.
  • The sensor array demonstrated sensitivity to variations in lanthanide ion concentrations.
  • The system showed potential for differentiating mixtures of lanthanide ions.

Conclusions:

  • The proposed colorimetric sensor array offers a promising approach for the selective detection and differentiation of lanthanide ions.
  • The sensor array's ability to analyze actual samples suggests potential for practical applications in environmental analysis.
  • This method provides a sensitive and specific tool for lanthanide ion recognition.