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Related Concept Videos

Volatilization01:10

Volatilization

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Profiling Volatile Compounds in Blackcurrant Fruit using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography-Mass Spectrometry
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Method for improving accuracy in full evaporation headspace analysis.

Wei-Qi Xie1,2, Xin-Sheng Chai1

  • 1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.

Journal of Separation Science
|March 22, 2017
PubMed
Summary
This summary is machine-generated.

A novel headspace analytical method combines multiple headspace extraction with full evaporation, significantly improving accuracy by minimizing pressure variations from sample solids. This automated technique broadens the applicability of full evaporation headspace analysis.

Keywords:
ethanolfull evaporationheadspace gas chromatographymultiple headspace extraction

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Conventional full evaporation headspace analysis is susceptible to measurement inaccuracies.
  • Pressure uncertainty, stemming from solid content fluctuations in samples, negatively impacts accuracy.

Purpose of the Study:

  • To introduce a new headspace analytical method.
  • To address and minimize pressure uncertainty in full evaporation headspace analysis.
  • To enhance the practicality and automation of headspace analysis.

Main Methods:

  • Incorporation of multiple headspace extraction (MHE) with the full evaporation (FE) technique.
  • Development of a full evaporation multiple headspace extraction (FEMHE) analysis technique.
  • Utilized ethanol solutions as a model sample for validation.

Main Results:

  • The FEMHE technique effectively minimizes pressure uncertainty caused by solid content changes.
  • Demonstrated improved measurement accuracy compared to conventional FE methods.
  • The method proved to be automated and practical for various applications.

Conclusions:

  • The proposed FEMHE technique offers a robust solution to accuracy issues in headspace analysis.
  • This method enhances the reliability and scope of full-evaporation-based headspace techniques.
  • The automation and practicality suggest broad applicability in chemical analysis.