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Related Concept Videos

Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

2.8K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
2.8K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

3.4K
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...
3.4K
EDTA: Conditional Formation Constant01:09

EDTA: Conditional Formation Constant

2.1K
Each EDTA molecule has six binding sites: four carboxyl groups and two amino groups. The fully protonated form of EDTA is represented as H6Y2+. However, it can exist in different forms, H5Y+, H4Y, H3Y−, H2Y2−, and HY3−, depending on the pH of the solution. In very basic solutions with pH > 10.17, the fully deprotonated form, Y4−, is the predominant species that readily complexes with metal ions in a 1:1 ratio.
For the equilibrium reaction of the metal with the...
2.1K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.4K
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...
1.4K
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

5.5K
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...
5.5K
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

2.2K
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...
2.2K

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Related Experiment Video

Updated: Feb 8, 2026

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
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Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method

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[Adsorption Cd2+ from Solution by EDTA-modified Silicate Nanoparticles].

Shun-Cheng Jiang1, Rui Qin1, Man-Lin Li2

  • 1College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
PubMed
Summary
This summary is machine-generated.

EDTA-modified silicate nanoparticles (nSiO2) show enhanced cadmium (Cd2+) adsorption. This engineered nanomaterial offers an effective solution for removing toxic Cd2+ from aqueous solutions.

Keywords:
Cd2+EDTAadsorptionmodificationnSiO2 nanoparticle

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Context:

  • Silicate nanoparticles (nSiO2) are versatile engineering materials.
  • Cadmium (Cd2+) is a toxic heavy metal pollutant requiring effective removal strategies.

Purpose:

  • To synthesize and characterize EDTA-modified nSiO2 nanoparticles.
  • To investigate the adsorption performance and mechanism of EDTA-nSiO2 for Cd2+ removal.

Summary:

  • EDTA-modified nSiO2 nanoparticles were successfully prepared and exhibited excellent stability.
  • Adsorption was significantly influenced by pH, temperature, and ionic strength, following Langmuir isotherm.
  • Cd2+ adsorption is an endothermic, spontaneous process driven by chemical chelation, physical adsorption, and ion exchange.

Impact:

  • EDTA-modified nSiO2 demonstrates superior Cd2+ adsorption capacity compared to raw nSiO2.
  • This engineered nanomaterial shows potential for practical applications in wastewater treatment for heavy metal removal.