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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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...
Mass Spectrum01:23

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...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Mode-filtered light methane gas sensor based on cryptophane A.

Suozhu Wu1, Yan Zhang, Zhongping Li

  • 1Research Center of Environmental Science and Engineering, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.

Analytica Chimica Acta
|January 27, 2009
PubMed
Summary
This summary is machine-generated.

A novel mode-filtered light sensor effectively detects methane (CH4) gas at ambient conditions. This cryptophane A-coated optical fiber sensor shows high sensitivity and accuracy for CH4 determination.

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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
08:18

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

Published on: June 12, 2016

Area of Science:

  • Chemical sensors
  • Optical sensing technologies
  • Gas detection

Background:

  • Accurate methane (CH4) detection is crucial for various industrial and environmental applications.
  • Existing methods for CH4 sensing may have limitations in sensitivity, selectivity, or operational conditions.
  • Development of novel chemosensors is essential for advancing gas detection capabilities.

Purpose of the Study:

  • To develop and characterize a mode-filtered light sensor for selective methane (CH4) gas determination.
  • To investigate the sensor's performance, including sensitivity, dynamic range, response time, and interference.
  • To evaluate the sensor's applicability for real-world CH4 sample analysis.

Main Methods:

  • Fabrication of a chemosensor using an optical fiber coated with cryptophane A within a fused-silica capillary.
  • Utilizing changes in refractive index due to CH4 inclusion to modulate mode-filtered light.
  • Monitoring light intensity changes via a charge-coupled device (CCD) at multiple detection windows.

Main Results:

  • The sensor demonstrated a decrease in mode-filtered light intensity with increasing CH4 concentration.
  • Achieved a dynamic concentration range of 0.0-16.0% v/v CH4 with a detection limit of 0.15% v/v.
  • Exhibited good reproducibility (RSD < 7%) and minimal interference from O2, H2, and CO2, though some interference from chlorinated solvents was noted.

Conclusions:

  • The developed mode-filtered light sensor offers a promising and accurate approach for ambient methane (CH4) detection.
  • The sensor's design allows for simultaneous monitoring and exhibits favorable performance characteristics.
  • This technology presents a viable alternative for CH4 sensing applications.