Comparative Study of the Detection of Chromium Content in Rice Leaves by 532 nm and 1064 nm Laser-Induced Breakdown Spectroscopy

Sensors
Jiyu PengYong He

Abstract

Fast detection of toxic metals in crops is important for monitoring pollution and ensuring food safety. In this study, laser-induced breakdown spectroscopy (LIBS) was used to detect the chromium content in rice leaves. We investigated the influence of laser wavelength (532 nm and 1064 nm excitation), along with the variations of delay time, pulse energy, and lens-to-sample distance (LTSD), on the signal (sensitivity and stability) and plasma features (temperature and electron density). With the optimized experimental parameters, univariate analysis was used for quantifying the chromium content, and several preprocessing methods (including background normalization, area normalization, multiplicative scatter correction (MSC) transformation and standardized normal variate (SNV) transformation were used to further improve the analytical performance. The results indicated that 532 nm excitation showed better sensitivity than 1064 nm excitation, with a detection limit around two times lower. However, the prediction accuracy for both excitation wavelengths was similar. The best result, with a correlation coefficient of 0.9849, root-mean-square error of 3.89 mg/kg and detection limit of 2.72 mg/kg, was obtained using the SNV transforme...Continue Reading

References

Apr 20, 2006·Analytical and Bioanalytical Chemistry·L FornariniV Lazic
Oct 31, 2008·Talanta·Richard E RussoSamuel S Mao
Nov 20, 2008·Journal of Integrative Plant Biology·Giovanni DalCorsoAntonella Furini
Nov 10, 2012·Analytical Chemistry·Francisco J FortesJ Javier Laserna
Sep 25, 2014·Sensors·Pavel PořízkaJozef Kaiser
May 23, 2015·Analytica Chimica Acta·Gabriel Gustinelli Arantes de CarvalhoJ Javier Laserna
Aug 1, 2015·Analytical and Bioanalytical Chemistry·Gábor Galbács

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Citations

Apr 21, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tingting ShenJiyu Peng
Oct 3, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Xiaodan LiuYong He
Nov 15, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tingting ShenYong He

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Software Mentioned

MSC
LIFBASE2

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