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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...

Qualitative Analysis

Qualitative Analysis

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...

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...

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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...

EDTA: Auxiliary Complexing Reagents

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 24, 2026

Oral Biofilm Formation on Different Materials for Dental Implants

Oral Biofilm Formation on Different Materials for Dental Implants

Published on: June 24, 2018

Elemental ion release from four different fixed prosthodontic materials.

Waleed Elshahawy¹, Ikuya Watanabe, Mari Koike

¹Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave., Dallas, TX 75246, USA. welshahawy@bcd.tamhsc.edu

Dental Materials : Official Publication of the Academy of Dental Materials

|March 24, 2009

Summary

This summary is machine-generated.

Elemental release from dental prosthodontic materials increases significantly in acidic environments. Nickel-chromium alloys showed higher nickel release, while gold alloys released more zinc and copper.

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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Published on: December 20, 2024

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Last Updated: Jun 24, 2026

Oral Biofilm Formation on Different Materials for Dental Implants

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Published on: June 24, 2018

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Area of Science:

Biomaterials Science
Dental Materials Science
Materials Chemistry

Background:

Elemental release from dental prosthodontic materials is a critical factor influencing their biocompatibility.
Understanding ion release mechanisms is essential for developing safer and more durable dental restorations.

Purpose of the Study:

To investigate and quantify the elemental ion release from four common fixed prosthodontic materials.
To compare ion release profiles in both neutral (NaCl) and acidic (lactic acid) environments.

Main Methods:

Four prosthodontic materials (gold alloy, nickel-chromium alloy, CAD-CAM ceramic, stainless-steel alloy) were prepared and polished.
Specimens were immersed in 0.9% sodium chloride and 1% lactic acid solutions at 37°C for 7 days.
Elemental release was quantified using inductively coupled plasma mass spectroscopy and statistically analyzed.

Main Results:

All tested materials exhibited higher elemental release in lactic acid compared to sodium chloride, except for silver.
Nickel-chromium alloy showed significantly higher nickel release in both solutions.
Gold alloy demonstrated increased release of zinc and copper in the acidic environment.

Conclusions:

Acidic conditions significantly enhance elemental ion release from prosthodontic materials.
Nickel-chromium and gold alloys are prone to higher ion release, particularly nickel, zinc, and copper, in acidic environments.
These findings highlight the importance of material selection and environmental factors in dental restorations.