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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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Masking and Demasking Agents01:19

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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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.5K
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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

1.5K
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Chromate Binding and Removal by the Molybdate-Binding Protein ModA.

Jason Karpus1, Michael Bosscher1, Ifedayo Ajiboye1

  • 1Department of Chemistry, University of Chicago, 929 East 57th Street, Chicago, IL, 60637, USA.

Chembiochem : a European Journal of Chemical Biology
|February 3, 2017
PubMed
Summary

Researchers discovered that the E. coli molybdate-binding protein ModA effectively removes toxic hexavalent chromate from water. This genetically encoded tool achieves levels below US federal standards, offering a cheap and safe environmental remediation method.

Keywords:
bioinorganic chemistryenvironmental chemistryfluorescence spectroscopyhexavalent chromiummetalloproteins

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Toxicology

Background:

  • Hexavalent chromate contamination poses significant environmental and human health risks.
  • Effective and affordable remediation techniques for hexavalent chromate are urgently needed.
  • Previous research indicated that the E. coli molybdate-binding protein ModA did not bind chromate.

Purpose of the Study:

  • To investigate the potential of the E. coli molybdate-binding protein ModA for chromate removal.
  • To determine if ModA can bind and remove hexavalent chromate from aqueous solutions.
  • To assess the efficiency of ModA in reducing chromate levels below regulatory standards.

Main Methods:

  • Utilized the E. coli molybdate-binding protein ModA as a bioremediation agent.
  • Tested ModA's ability to bind and remove chromate from contaminated water.
  • Quantified chromate concentrations before and after treatment with ModA.

Main Results:

  • Demonstrated that ModA binds chromate tightly, contrary to previous reports.
  • Showcased ModA's capability to remove hexavalent chromate from aqueous solutions.
  • Achieved chromate removal levels significantly below current US federal standards.

Conclusions:

  • The E. coli ModA protein is a viable, genetically encoded tool for effective chromate removal.
  • ModA offers a promising, low-cost, and safe method for environmental remediation of chromate.
  • This finding opens new avenues for biotechnological solutions to heavy metal contamination.