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Quantitative Analysis of Nitrogen in Compound Fertilizers Using Laser-Induced Breakdown Spectroscopy Coupled with Multivariate Regression
Abstract
Quantitative analyses of the nitrogen concentration in compound fertilizer were performed using laserinduced breakdown spectroscopy (LIBS). Thirty-two samples were used as a calibration set, and eight samples were used as a validation set. To eliminate the matrix effect, partial least-squares regression (PLSR) and least-squares support vector regression (LS-SVR) were used to establish models. For the partial leastsquares regression model, the correlation coefficients for the calibration and prediction sets were 0.837 and 0.794, respectively. While using the LS-SVR method, the correlation coefficients for the calibration and prediction sets were improved to 0.994 and 0.993, respectively. Therefore, the LS-SVR method improved the analysis accuracy. The prediction mean absolute error was 0.023%. The results indicate that LIBS coupled with LS-SVR is a reliable and accurate method for determining the nitrogen concentration in compound fertilizer.
Keywords
Supporting agencies: We are grateful to the Red Sifang Group, Hefei City, Anhui Province for providing the fertilizer samples. This work has been supported by the Key Projects of Natural Science in Colleges and Universities in Anhui Province (KJ2020A0656，KJ2021A0977), Science and Technology Major Special Project of Anhui Province (202103a07020009), the talent research fund project of Hefei University (20RC11, 18-19RC56, 18-19RC53, and 18-19RC51), Natural National Science Foundation of China (NSFC) (61505001), Anhui Key Laboratory of Mine Intelligent Equipment and Technology, Anhui University of Science & Technology (KSZN202001003), Key Subject of Hefei University: Information and Communication Engineering (2018xk03).
About the Authors
C. Lu
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
Ch. Shi
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
H. Dai
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
G. Lv
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
Zh. Zhang
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
F. Jin
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
B. Hu
School of Advanced Manufacturing Engineering at Hefei University
China
China
Hefei
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Review
For citations:
Lu C., Shi Ch., Dai H., Lv G., Zhang Zh., Jin F., Hu B. Quantitative Analysis of Nitrogen in Compound Fertilizers Using Laser-Induced Breakdown Spectroscopy Coupled with Multivariate Regression. Zhurnal Prikladnoii Spektroskopii. 2022;89(4):541-547.
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