Chemometrics Method for Real-Time Measurement of Water COD Based on Laser-Induced Breakdown Spectroscopy
YE Song1, GU Ya-hui1,2, DU Xiao-fan2, ZHANG Wen-tao1, WANG Jie-jun1, WANG Xin-qiang1, DONG Da-ming1,2*
1. Guilin University of Electronic Technology, Guilin 541004, China
2. Beijing Research Center for Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Abstract：Using spectroscopy sensing technology to measure water COD is the trend of development of modern environmental monitoring. Compared to the traditional chemical analysis is has the benefits of online continuous detection of environmental water samples for real-time monitoring of water COD. This paper collected real water samples, using laser-induced breakdown spectroscopy (LIBS) to obtain water samples of spectral data. Establish water sample COD quantitative prediction model combining Partial Least Squares regression (PLS) by different spectral pretreatment method, then quantitative prediction of LIBS spectrum measurement method of water COD and the relevant model parameters were analyzed. Found that the baseline correction superimposed S-Golay derivative partial least-squares model had better prediction results. The determination coefficient of calibration samples were 0.995 8, while the determination coefficient of prediction were 0.975 3, with RMSEC of 4.438 7 and RMSEP of 9.733 9. The experimental results showed that spectrum sensing technology can be used in the actual environment of water COD quantitative predictive analysis, laid the theoretical foundation for the development of portable water testing equipment.
叶 松，顾亚辉，杜晓凡，张文涛，汪杰君，王新强，董大明. 基于激光诱导击穿光谱和化学计量学的水体COD实时测量方法[J]. 光谱学与光谱分析, 2017, 37(11): 3585-3589.
YE Song, GU Ya-hui, DU Xiao-fan, ZHANG Wen-tao, WANG Jie-jun, WANG Xin-qiang, DONG Da-ming. Chemometrics Method for Real-Time Measurement of Water COD Based on Laser-Induced Breakdown Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(11): 3585-3589.
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