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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 7 — Mar. 1, 2012
  • pp: B149–B154

Application of laser-induced breakdown spectroscopy for total carbon quantification in soil samples

Krishna K. Ayyalasomayajula, Fang Yu-Yueh, Jagdish P. Singh, Dustin L. McIntyre, and Jinesh Jain  »View Author Affiliations


Applied Optics, Vol. 51, Issue 7, pp. B149-B154 (2012)
http://dx.doi.org/10.1364/AO.51.00B149


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Abstract

The increase of greenhouse gas (i.e., CO2) levels in the atmosphere has caused noticeable climate change. Many nations are currently looking into methods of permanent underground storage for CO2 in an attempt to mitigate this problem. The goal of this work is to develop a process for studying the total carbon content in soils before, during, and after CO2 injection to ensure that no leakage is occurring or to determine how much is leaking if it is occurring and what effect it will have on the ecosystem between the injection formation and the atmosphere. In this study, we quantitatively determine the total carbon concentration in soil using laser-induced breakdown spectroscopy (LIBS). A soil sample from Starkville, Mississippi, USA was mixed with different amounts of carbon powder, which was used as a calibration for additional carbon in soil. Test samples were prepared by adding different but known amounts of carbon powder to a soil sample and then mixing with polyvinyl alcohol binder before being pressed into pellets. LIBS spectra of the test samples were collected and analyzed to obtain optimized conditions for the measurement of total carbon in soil with LIBS. The total carbon content in the samples was also measured by a carbon analyzer, and the data (average of triplicates) were used as a reference in developing calibration curves for a modified version of the single linear regression model and the multiple linear regression model. The calibration data were then used to determine the total carbon concentration of an unknown sample. This work is intended to be used in the initial development of a miniaturized, field-portable LIBS analyzer for CO2 leak detection.

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: October 4, 2011
Revised Manuscript: December 23, 2011
Manuscript Accepted: January 25, 2012
Published: February 27, 2012

Citation
Krishna K. Ayyalasomayajula, Fang Yu-Yueh, Jagdish P. Singh, Dustin L. McIntyre, and Jinesh Jain, "Application of laser-induced breakdown spectroscopy for total carbon quantification in soil samples," Appl. Opt. 51, B149-B154 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-7-B149

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