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Related Concept Videos

Complexometric Titration: Overview00:39

Complexometric Titration: Overview

12.9K
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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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...
28.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
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...
2.6K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
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...
1.3K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
25.4K
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

669
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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Luminometric Label Array for Quantification and Identification of Metal Ions.

Sari Pihlasalo1,2, Ileana Montoya Perez3, Niklas Hollo2

  • 1Laboratory of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku , Vatselankatu 2, 20500 Turku, Finland.

Analytical Chemistry
|April 19, 2016
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Summary

A new label array method accurately quantifies and identifies metal ions in drinking water. This simple technique offers a unique luminescence profile for detecting various metal ions and their oxidation states.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Accurate quantification and identification of metal ions are crucial for drinking water and environmental safety.
  • Existing methods for metal ion analysis can be complex or require specialized equipment.

Purpose of the Study:

  • To develop a novel, simple, and ready-to-go method for the quantification and identification of metal ions in drinking water.
  • To establish a label array technique that utilizes nonspecific interactions for unique signal generation.

Main Methods:

  • Development of a label array method employing unstable lanthanide chelates and non-antenna ligands.
  • Utilizing the unique luminescence signal profile generated from the interaction of the array with sample components.
  • Validation of the method for detecting multiple metal ions and their different oxidation states.

Main Results:

  • Achieved a limit of detection at the parts per billion (ppb) concentration level.
  • Demonstrated an average coefficient of variation of 10%, indicating good reproducibility.
  • Successfully identified 15 different metal ions, including various oxidation states (e.g., Cr(3+)/Cr(6+), Cu(+)/Cu(2+), Fe(2+)/Fe(3+), Pb(2+)/Pb(4+)).
  • Distinguished individual ions in binary (Cu(2+)/Fe(3+)) and ternary (Cd(2+)/Ni(2+)/Pb(2+)) mixtures.

Conclusions:

  • The developed label array method provides a sensitive and specific approach for metal ion analysis in drinking water.
  • This technique offers a simplified alternative for identifying multiple metal ions and their oxidation states simultaneously.
  • The method holds potential for routine environmental monitoring and water quality assessment.