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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Optimizing Chromatographic Separations01:15

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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Chromatographic Methods: Classification01:12

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Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface.
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Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

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In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
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Chlorinated solvents source identification by nonlinear optimization method.

Valeureux D Illy1,2, Gregory J V Cohen3, Elicia Verardo3

  • 1EA 4592, Géoressources Et Environnement, Bordeaux INP, Université Bordeaux Montaigne, 1 Avenue Dr Schweitzer, 33400, Talence, France. valeureux.illy@gmail.com.

Environmental Monitoring and Assessment
|April 2, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method using chloride ions and chlorinated compounds to trace groundwater contamination. The robust technique accurately identifies sources of chlorinated solvents with less than 11% uncertainty.

Keywords:
Chlorinated solventsCompound-specific isotope ratiosConservative tracersMixing modelsNonlinear optimization

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Analytical Chemistry

Background:

  • Chlorinated solvents are common groundwater contaminants.
  • Accurate source identification is crucial for effective remediation.
  • Existing methods for source apportionment have limitations.

Purpose of the Study:

  • To develop and validate a novel method for identifying sources of chlorinated solvent contamination in groundwater.
  • To utilize conservative tracers and carbon isotope ratios for enhanced source apportionment.
  • To assess the robustness and uncertainty of the developed identification method.

Main Methods:

  • Chloride ions used as conservative tracers.
  • Supplementation with chloroethenes (PCE, TCE, Cis-DCE, 1,1-DCE) and chloroethanes (1,1,1-TCA, 1,1-DCA).
  • Analysis of carbon isotope ratios of key compounds.
  • Calculation of mixing fractions to locate potential sources.

Main Results:

  • Successfully calculated mixing fractions for contaminant sources.
  • Proposed locations for potential previously unidentified contaminant sources.
  • Demonstrated that measurement errors result in less than 11% uncertainty in mixture fraction calculations.

Conclusions:

  • The developed method is a robust tool for identifying sources of chlorinated solvents in groundwater.
  • The approach offers a significant improvement over existing optimization methods.
  • Accurate source identification is achievable even with measurement uncertainties.