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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.1K
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...
2.1K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.1K
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...
1.1K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.2K
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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Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

5.4K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
5.4K
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1.3K
Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
1.3K

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Complexation by Organic Matter Controls Uranium Mobility in Anoxic Sediments.

Sharon E Bone1, John Cliff2, Karrie Weaver3

  • 1Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , United States.

Environmental Science & Technology
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PubMed
Summary

Uranium contamination in groundwater is a global concern. This study reveals that uranium in sediments primarily binds to organic matter, influencing its mobility and release into drinking water sources.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Environmental Chemistry

Background:

  • Uranium contamination in drinking water poses a global health risk.
  • Tetravalent uranium [U(IV)] in alluvial sediments is a key concern, though its mobility is poorly understood.
  • Natural organic matter (OM) is increasingly recognized as a factor in uranium's subsurface fate.

Purpose of the Study:

  • To characterize the chemical forms and associations of U(IV) in contaminated alluvial sediments.
  • To understand the role of organic matter in retaining and mobilizing uranium.
  • To provide a framework for predicting uranium mobility in groundwater.

Main Methods:

  • Density-based fractionation to separate sediment components.
  • Nanoscale imaging techniques, including nano secondary ion mass spectrometry (nanoSIMS) and scanning transmission X-ray microscopy (STXM).
  • Microscopic and physical isolation of organic and mineral fractions.

Main Results:

  • Two distinct populations of U(IV) were identified in anoxic sediments.
  • Uranium was predominantly associated with organic matter, including particulate organic carbon (microbial and plant-derived).
  • Uranium was also found adsorbed to clay minerals and organic matter-coated clay minerals.

Conclusions:

  • The strong association of uranium with organic matter is a critical factor controlling its mobility in shallow subsurface environments.
  • Desorption from organic matter and colloid formation are key mechanisms for uranium mobilization.
  • Understanding OM-uranium interactions is essential for managing contaminated groundwater resources.