Improving the application of laser-induced breakdown spectroscopy for the determination of total carbon in soils
- Improving the application of laser-induced breakdown spectroscopy for the determination of total carbon in soils
- Carbon; Climate change; Delay time; Fe interference; Laser-induced breakdown spectroscopy (LIBS); Soil
- Issue Date
- ENVIRONMENTAL MONITORING AND ASSESSMENT, v. 187, NO 2, Page. 1-11
- The increase of atmospheric greenhouse gases
such as CO2 has caused noticeable climate change.
Since increased CO2may 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 nmhas 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.
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