Quantitative Analysis of Nutrient Elements in Soil Using Single and Double-Pulse Laser-Induced Breakdown Spectroscopy

Sensors
Yong HeShaoming Luo

Abstract

Rapid detection of soil nutrient elements is beneficial to the evaluation of crop yield, and it's of great significance in agricultural production. The aim of this work was to compare the detection ability of single-pulse (SP) and collinear double-pulse (DP) laser-induced breakdown spectroscopy (LIBS) for soil nutrient elements and obtain an accurate and reliable method for rapid detection of soil nutrient elements. 63 soil samples were collected for SP and collinear DP signal acquisition, respectively. Macro-nutrients (K, Ca, Mg) and micro-nutrients (Fe, Mn, Na) were analyzed. Three main aspects of all elements were investigated, including spectral intensity, signal stability, and detection sensitivity. Signal-to-noise ratio (SNR) and relative standard deviation (RSD) of elemental spectra were applied to evaluate the stability of SP and collinear DP signals. In terms of detection sensitivity, the performance of chemometrics models (univariate and multivariate analysis models) and the limit of detection (LOD) of elements were analyzed, and the results indicated that the DP-LIBS technique coupled with PLSR could be an accurate and reliable method in the quantitative determination of soil nutrient elements.

References

Jul 30, 2004·Applied Spectroscopy·Ronny D HarrisBrian K Bluhm
Mar 15, 2011·Analytical and Bioanalytical Chemistry·Ali KhumaeniKiichiro Kagawa
Jul 11, 2014·Analytical Chemistry·Franco Allegrini, Alejandro C Olivieri

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Citations

Apr 21, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tingting ShenJiyu Peng

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