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Related Concept Videos

Complexometric Titration: Overview00:39

Complexometric Titration: Overview

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 indicator. The...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

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...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...

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Related Experiment Video

Updated: Jun 28, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
05:35

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Indirect complexometric determination of beryllium.

A De Sousa1

  • 1Brigus, Conception Bay, Newfoundland, Canada.

Talanta
|October 1, 1975
PubMed
Summary
This summary is machine-generated.

A new indirect complexometric method accurately determines beryllium by selectively precipitating it. Beryllium is then quantified by titrating magnesium after phosphate removal using ion-exchange chromatography.

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Area of Science:

  • Analytical Chemistry
  • Inorganic Chemistry

Background:

  • Accurate determination of beryllium is crucial in various industrial and environmental applications.
  • Existing analytical methods for beryllium may lack selectivity or require complex procedures.

Purpose of the Study:

  • To develop and validate a novel indirect complexometric method for the selective determination of beryllium.
  • To establish a reliable and efficient analytical procedure for beryllium quantification.

Main Methods:

  • Selective precipitation of beryllium as Be(NH4)PO4.
  • Ion-exchange chromatography to separate beryllium from phosphate ions.
  • Complexometric titration of magnesium with EDTA after phosphate precipitation.

Main Results:

  • The method allows for the selective retention of beryllium on an ion-exchange column.
  • Phosphate is effectively removed, enabling accurate magnesium determination.
  • Beryllium concentration is accurately derived from the measured magnesium content.

Conclusions:

  • The described indirect complexometric method provides a selective and reliable approach for beryllium determination.
  • This technique offers an efficient alternative for analyzing beryllium in various matrices.