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Related Experiment Videos

Measuring total soil carbon with laser-induced breakdown spectroscopy (LIBS).

D A Cremers1, M H Ebinger, D D Breshears

  • 1Advanced Chemical Diagnostics and Instrumentation Group, Los Alamos National Lab., NM 87545, USA.

Journal of Environmental Quality
|January 16, 2002
PubMed
Summary

A new laser-induced breakdown spectroscopy (LIBS) method offers rapid and accurate total soil carbon analysis. This field-adaptable technique promises to improve soil carbon inventories and global change research.

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Area of Science:

  • Soil Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Accurate soil carbon inventories are crucial for understanding global carbon cycling and climate change.
  • Current methods for total soil carbon analysis are often slow and not field-portable, limiting large-scale assessments.

Purpose of the Study:

  • To evaluate the efficacy of laser-induced breakdown spectroscopy (LIBS) as a rapid and accurate method for determining total soil carbon.
  • To assess the potential of LIBS for field deployment in soil carbon research.

Main Methods:

  • Laser-induced breakdown spectroscopy (LIBS) was employed to analyze soil samples.
  • Spectral signatures for total soil carbon were identified and calibrated using dry combustion measurements of Mollisol and Alfisol samples.

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  • LIBS-predicted carbon concentrations were compared against dry combustion data.

    • Main Results:

    • The LIBS method demonstrated rapid analysis (under one minute per sample) with excellent detection limits (~300 mg/kg), precision (4-5%), and accuracy (3-14%).
    • LIBS measurements showed a high correlation (adjusted r2 = 0.96) with traditional dry combustion methods across different soil types.
    • The technique is adaptable to portable instrumentation, facilitating field use.

    Conclusions:

    • LIBS presents a promising, efficient, and accurate alternative for measuring total soil carbon, potentially revolutionizing soil carbon inventory and global change studies.
    • Further research is needed to investigate the influence of soil properties like texture, moisture, and mineralogy on LIBS measurements.