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Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
Published on: September 23, 2013
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
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.
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.
- 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.
