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Related Concept Videos

Noble Gases02:54

Noble Gases

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
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Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
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Noble gas adsorption to tuff.

Kirk J Cantrell1, Guohui Wang1, Alexandre V Mitroshkov1

  • 1Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA.

Journal of Environmental Radioactivity
|January 7, 2022
PubMed
Summary
This summary is machine-generated.

This study measured noble gas adsorption on geologic materials. Adsorption increased with atomic mass and decreased with temperature, offering insights into gas interactions with geological formations.

Keywords:
AdsorptionNoble gasesNuclear explosion monitongTuff

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Materials Science

Background:

  • Understanding trace noble gas adsorption is crucial for geological storage and environmental monitoring.
  • Background gases can compete for adsorption sites, complicating measurements.
  • Geologic materials present complex surfaces for gas adsorption studies.

Purpose of the Study:

  • To develop and apply a method for measuring trace noble gas adsorption on geologic materials.
  • To quantify the adsorption of neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe) under varying conditions.
  • To investigate the influence of temperature, background gas, and noble gas concentration on adsorption.

Main Methods:

  • Developed a method to measure trace noble gas adsorption in the presence of competing background gases.
  • Utilized crushed tuff as the geologic material sample.
  • Measured adsorption of Ne, Ar, Kr, and Xe at concentrations of 100, 250, and 500 ppm in helium and nitrogen at various temperatures (0-45 °C).

Main Results:

  • Noble gas adsorption increased with atomic mass and decreased with temperature.
  • The effect of temperature on adsorption was more pronounced for heavier noble gases.
  • Adsorption showed a slightly non-linear relationship with concentration, modeled by the Freundlich isotherm.
  • Henry's Law constants were determined for concentrations ≤100 ppm.

Conclusions:

  • Noble gas adsorption on geologic materials is strongly dependent on atomic mass and temperature.
  • The developed method effectively quantifies adsorption in complex gas mixtures.
  • Findings have implications for geological sequestration, environmental sensing, and understanding gas-rock interactions.