Improving the application of laser-induced breakdown spectroscopy for the determination of total carbon in soils

Hang Vo Minh Nguyen, Seung Jae Moon, Jung Hyun Choi

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The increase of atmospheric greenhouse gases such as CO2 has caused noticeable climate change. Since increased CO2 may contribute to carbon storage in terrestrial ecosystems through the CO2 cycle between the atmosphere and vegetation, it is necessary to improve methods for measuring C in soil. In this study, we determined the total carbon concentrations of soils using a highly sensitive and rapid method, laser-induced breakdown spectroscopy. The presence of C has been measured by detecting signal at the wavelength of 247.86 nm. The obstacle of Fe interference at the C measurement wavelength of 247.86 nm was reduced by selecting the optimal delay time of 1.4 μs. The ratio of peak intensities (areas) at 247.86 nm for C and 248.20 nm for Fe was then successfully applied to the calibration curve. In addition, to dismiss the problem of measuring the C lines at 247.86 nm, 193.03 nm has been used to observe C emission. Both the 193.03- and 247.86-nm lines provided significant linear calibrations. The 193.03-nm lines presented stronger relative accuracies in predicting the lower C concentrations of the unknown samples than that one at 247.86 nm.

Original languageEnglish
Article number28
Pages (from-to)1-11
Number of pages11
JournalEnvironmental Monitoring and Assessment
Volume187
Issue number2
DOIs
StatePublished - 2015 Feb

Keywords

  • Carbon
  • Climate change
  • Delay time
  • Fe interference
  • Laser-induced breakdown spectroscopy (LIBS)
  • Soil

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