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Matrix effect suppressing in the element analysis of soils by laser-induced breakdown spectroscopy with acoustic correction

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Plasma Science and Technology 2023年第12期25卷 97-104页

作者：何智权刘莉郝中骐徐智帅王奇卢颖赵梓屹史久林何兴道 Key Laboratory of Opto-electronic Information Science and Technology of Jiangxi Province Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Jiangxi Engineering Laboratory for Optoelectronics Testing Technology Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Key Laboratory of Nondestructive Testing(Nanchang Hangkong University) Ministry of EducationNanchang 330063People’s Republic of China

Laser-induced breakdown spectroscopy(LIBS)has been used for soil analysis,but its measurement accuracy is often influenced by matrix effects of different kinds of *** this work,a method for matrix effect suppressing was developed using laser-induced plasma acoustic signals to correct the original spectrum,thereby improving the analysis accuracy of the soil elements.A good linear relationship was investigated firstly between the original spectral intensity and the acoustic *** relative standard deviations(RSDs)of Mg,Ca,Sr,and Ba elements were then calculated for both the original spectrum and the spectrum with the acoustic correction,and the RSDs were significantly reduced with the acoustic ***,calibration curves of MgⅠ285.213 nm,CaⅠ422.673 nm,SrⅠ460.733 nm and BaⅡ455.403 nm were established to assess the analytical performance of the proposed acoustic correction *** values of the determination coefficient(R~2)of the calibration curves for Mg,Ca,Sr,and Ba elements,corrected by the acoustic amplitude,are improved from 0.9845,0.9588,0.6165,and 0.6490 to 0.9876,0.9677,0.8768,and 0.8209,*** values of R~2 of the calibration curves corrected by the acoustic energy are further improved to 0.9917,0.9827,0.8835,and 0.8694,*** results suggest that the matrix effect of LIBS on soils can be clearly improved by using acoustic correction,and acoustic energy correction works more efficiently than acoustic amplitude *** work provides a simple and efficient method for correcting matrix effects in the element analysis of soils by acoustic signals.

关键词： laser-induced breakdown spectroscopy acoustic correction matrix effect calibration curve relative standard deviation

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