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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Updated: Sep 22, 2025

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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Raman Natural Gas Analyzer: Effects of Composition on Measurement Precision.

Dmitry V Petrov1,2, Ivan I Matrosov1, Alexey R Zaripov1

  • 1Institute of Monitoring of Climatic and Ecological Systems, 634055 Tomsk, Russia.

Sensors (Basel, Switzerland)
|May 20, 2022
PubMed
Summary
This summary is machine-generated.

Raman spectroscopy offers fast, simultaneous natural gas analysis with minimal calibration needs. However, methane spectral line variations can impact oxygen measurements and neglecting heavier alkanes causes errors in gas properties.

Keywords:
Raman spectroscopyalkanesgas analysisheating valueisotopic compositionmethanenatural gas

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Natural Gas Analysis

Background:

  • Raman spectroscopy provides rapid, simultaneous molecular analysis.
  • Accurate natural gas composition analysis is crucial for energy applications.
  • Traditional methods like gas chromatography require frequent calibration.

Purpose of the Study:

  • To evaluate the stability and calibration requirements of Raman spectroscopy for natural gas analysis.
  • To identify potential sources of error in Raman spectroscopy measurements of natural gas.
  • To assess the impact of neglecting certain components on overall gas property calculations.

Main Methods:

  • Raman spectroscopy was used to analyze natural gas samples with compositions ranging from 0.005% to 100%.
  • Concentration variations were monitored over three weeks to assess measurement stability.
  • Spectral line widths and their effect on concentration measurements were investigated.

Main Results:

  • Raman spectroscopy measurements showed minimal variation over three weeks, comparable to spectral noise, indicating infrequent calibration needs.
  • Changes in gas composition were found to alter methane spectral line widths, leading to potential oxygen concentration errors up to 200 ppm.
  • Omitting pentanes and n-hexane measurements resulted in inaccuracies in calculated concentrations of other alkanes, density, and heating value.

Conclusions:

  • Raman spectroscopy is a stable and low-maintenance alternative to gas chromatography for natural gas analysis.
  • Accurate quantification requires accounting for spectral line broadening effects and including all relevant hydrocarbon components.
  • Precise measurement of all components, including heavier alkanes, is essential for reliable natural gas property determination.