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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Updated: Jul 2, 2026

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

Published on: July 26, 2024

A novel, low-cost, high performance dissolved methane sensor for aqueous environments.

Cédric Boulart1, Matthew C Mowlem, Douglas P Connelly

  • 1National Oceanography Centre, Southampton, Waterfront Campus, European Way, SO14 3ZH Southampton, UK. cbo@noc.soton.ac.uk

Optics Express
|August 20, 2008
PubMed
Summary

A novel sensor detects dissolved methane in water with high sensitivity (0.2 nM detection limit). This method uses a modified polymer layer and surface plasmon resonance for accurate, in-situ measurements in various environmental conditions.

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

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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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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:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Accurate measurement of dissolved methane is crucial for environmental monitoring.
  • Existing methods for methane detection can be limited in sensitivity and in-situ applicability.
  • Developing sensitive and selective methane sensors is an ongoing research area.

Purpose of the Study:

  • To present a new method for in-situ detection and measurement of dissolved methane in aqueous environments.
  • To achieve a low limit of detection and a suitable measurement range for environmental applications.
  • To demonstrate the sensor's specificity, sensitivity, and reversibility under varying conditions.

Main Methods:

  • Utilized a modified PolyDiMethylSiloxane (PDMS) layer incorporating cryptophane-A molecules for selective methane binding.
  • Employed surface plasmon resonance (SPR) for accurate refractive index (RI) modulation measurement.
  • Tested a prototype sensor using a dissolved gas calibration system across different temperatures and salinities.

Main Results:

  • Achieved a limit of detection of 0.2 nM (3 sigma) with a response time (t90) of approximately 110 seconds.
  • Demonstrated a measurement range of 1-300 nM for dissolved methane.
  • Laboratory tests confirmed the sensor's specificity, sensitivity, and reversibility.

Conclusions:

  • The developed method offers a sensitive and specific approach for in-situ dissolved methane detection.
  • The sensor technology is suitable for miniaturization and integration into field-deployable monitoring systems.
  • This technique has potential applications in environmental monitoring and research.