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Extraction: Advanced Methods

Extraction: Advanced Methods

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...

Complexometric Titration: Ligands

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...

Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

EDTA: Chemistry and Properties

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...

Masking and Demasking Agents

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

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Related Experiment Video

Updated: Jun 29, 2026

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

Polyacidic multiloading metal extractants.

Ross J Gordon¹, John Campbell, David K Henderson

¹School of Chemistry, The University of Edinburgh, Edinburgh, UK EH9 3JJ.

Chemical Communications (Cambridge, England)

|October 3, 2008

Summary

This summary is machine-generated.

New ligands enhance base metal recovery through solvent extraction. These novel compounds improve transport efficiencies, making metal recovery more effective.

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Published on: July 14, 2015

Area of Science:

Coordination Chemistry
Hydrometallurgy
Separation Science

Background:

Solvent extraction is crucial for base metal recovery.
Improving transport efficiencies is key to optimizing this process.

Purpose of the Study:

To design novel polynucleating, di-, and tri-acidic ligands.
To enhance molar and mass transport efficiencies in solvent extraction for base metals.

Main Methods:

Ligand synthesis and characterization.
Solvent extraction experiments were conducted.
Transport efficiency was evaluated.

Main Results:

Novel ligands were successfully synthesized.
The designed ligands demonstrated increased molar transport efficiency.
Enhanced mass transport was observed, improving base metal recovery.

Conclusions:

The developed ligands are effective in improving solvent extraction processes.
These ligands offer a promising approach for efficient base metal recovery.