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Mass Spectrum

Mass Spectrum

A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...

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Gas Chromatography: Types of Detectors-II

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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

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Heavy methanes as atmospheric tracers.

G A Cowan, D G Ott, A Turkevich

Science (New York, N.Y.)

|March 12, 1976

Summary

Methane-21, a nonradioactive tracer, was successfully detected thousands of kilometers away. This demonstrates its potential for testing large-scale atmospheric transport and diffusion models.

Area of Science:

Atmospheric Science
Environmental Chemistry

Background:

Accurate atmospheric transport and diffusion models are crucial for understanding environmental processes.
Nonradioactive tracers offer a safe alternative for long-range atmospheric studies.

Purpose of the Study:

To evaluate the utility of Methane-21 ((13)CD(4)) as a nonradioactive tracer for continental-scale atmospheric transport and diffusion model testing.
To demonstrate the long-range detection capabilities of Methane-21.

Main Methods:

A controlled release of 84 grams of Methane-21 was conducted.
Air samples were collected at distances ranging from 1500 to 2500 kilometers from the release point.
Methane was separated from air samples, and Methane-21 content was quantified using mass spectrometry.

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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Published on: February 19, 2018

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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

Published on: February 19, 2018

Main Results:

Methane-21 was detected at long distances (1500-2500 km).
Concentrations detected were approximately 1 part in 2 x 10(16) parts by volume.
The experiment confirmed the feasibility of detecting Methane-21 at significant atmospheric distances.

Conclusions:

Methane-21 ((13)CD(4)) is a viable nonradioactive tracer for continental-scale atmospheric studies.
The detection method using mass spectrometry is effective for identifying Methane-21 at low concentrations over long distances.
This tracer has significant potential for validating atmospheric transport and diffusion models.