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Related Experiment Videos

A simple pore water hydrogen diffusion syringe sampler.

Don A Vroblesky1, Francis H Chapelle, Paul M Bradley

  • 1U.S. Geological Survey, 720 Gracern Road, Columbia, SC 29210-7651, USA. dvroblesk@usgs.gov

Ground Water
|November 2, 2007
PubMed
Summary
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A new syringe sampler allows for easy measurement of dissolved molecular hydrogen (H(2)) in aquatic sediments and bedrock. This method improves understanding of microbial metabolism and electron accepting processes in challenging environments.

Area of Science:

  • Environmental microbiology
  • Geochemistry
  • Analytical chemistry

Background:

  • Molecular hydrogen (H(2)) is a key indicator of microbial metabolism and terminal electron-accepting processes in subsurface environments.
  • Measuring dissolved H(2) in groundwater is common, but challenging in saturated sediments and fractured bedrock.
  • Existing methods are often impractical for direct sampling in these challenging environments.

Purpose of the Study:

  • To design and develop a simple, syringe-based sampler for dissolved molecular hydrogen (H(2)).
  • To test the sampler's efficacy in various challenging aquatic and subsurface environments.
  • To provide a practical tool for assessing microbial processes in previously inaccessible locations.

Main Methods:

  • Development of a novel syringe-based sampling device for dissolved H(2).

Related Experiment Videos

  • Laboratory and field testing of the sampler in saturated riparian sediments, surface water bed sediments, and packed intervals of fractured bedrock boreholes.
  • Comparison with standard sampling methods where applicable.

    • Main Results:

    • The syringe sampler was successfully designed, developed, and tested.
    • The sampler proved effective for collecting H(2) samples in saturated sediments and fractured bedrock.
    • The device offers a practical and simple solution for H(2) measurement in challenging environments.

    Conclusions:

    • The developed syringe sampler provides a viable and practical method for measuring dissolved H(2) in saturated aquatic sediments and fractured bedrock.
    • This tool can enhance the understanding of microbial metabolism and geochemical processes in environments previously difficult to sample.
    • The sampler facilitates routine H(2) measurements, aiding in the diagnosis of terminal electron-accepting processes.