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Related Concept Videos

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume03:43

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The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT,  suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
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Related Experiment Video

Updated: Jan 2, 2026

Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
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Stable Carbon Isotope Ratio Measurements With a Gas Density Meter.

S P Wasik1, W Tsang1

  • 1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|December 12, 2019
PubMed
Summary

This study introduces a new method for measuring carbon isotope ratios in organic compounds. The technique uses combustion, gas chromatography, and a gas density meter for precise analysis.

Keywords:
Carbon-13carbon dioxideethyl acetategas chromatographygas density meterisotope ratios

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Area of Science:

  • Analytical Chemistry
  • Isotope Geochemistry

Background:

  • Stable isotope analysis is crucial for understanding various scientific processes.
  • Accurate measurement of carbon isotope ratios (C13/C12) is vital in fields like environmental science and metabolomics.

Purpose of the Study:

  • To present a novel method for determining the C13/C12 isotope ratio in organic compounds.
  • To demonstrate the applicability and precision of the developed technique.

Main Methods:

  • Combustion of organic material in a normal carbon dioxide (CO2) stream.
  • Separation of combustion products using gas chromatography.
  • Sequential measurement of the CO2 peak density with a gas density meter.

Main Results:

  • Successful analysis of enriched ethyl acetate samples with varying enrichment levels (1% to 15%).
  • Demonstrated the capability of the method for precise isotope ratio determination.
  • Validated the method's applicability for other stable isotope analyses.

Conclusions:

  • The presented method offers a reliable approach for C13/C12 isotope ratio measurement.
  • The technique is versatile and can be adapted for analyzing other stable isotopes in organic compounds.