井冈山大学学报（自然科学版）2026，Vol.47Issue(1)：30-36,7.DOI:10.3969/j.issn.1674-8085.2026.01.004
磁约束下的LIBS技术对土壤中重金属元素检测研究
Detection and analysis of heavy metal elements in soil by LIBS technology under magnetic confinement
摘要
Abstract
The study investigates the detection of heavy metal elements in several standard soil samples using laser-induced breakdown spectroscopy(LIBS)under magnetic confinement.The copper(Cu)is selected as the primary analysis object.When the external magnetic field strengths of 0 T,0.32 T,and 0.58 T are applied,the spectral intensity and signal-to-background ratio(SBR)of Cu increase.However,a decrease in spectral line intensity is observed when the Cu concentration reaches 147 ppm,which is analyzed to be potentially related to the self-absorption effect.To explore the underlying mechanism of magnetic field enhancement in LIBS,the iron(Fe)with abundant and stable spectral lines is selected for further analysis.The results indicate that the magnetic field significantly increases its electron temperature and density during the plasma evolution stage.To overcome the influence of self-absorption on quantitative analysis,calibration curves for Cu are constructed using the absolute intensity method,considering scenarios with or without magnetic field application and with or without self-absorption correction.Compared to applying only a magnetic field around the sample,the combination of the self-absorption correction method and magnetic confinement improves the detection limit for soil quantitative analysis from 24.94 ppm to 1.167 ppm and increases the correlation coefficient from 0.963 to 0.994.This work demonstrates that the integration of magnetic confinement and self-absorption correction can enhance the spectral performance of LIBS technology and improve the accuracy and sensitivity of heavy metal element detection.关键词
激光诱导击穿光谱技术/磁场约束/重金属元素/定量分析/自吸收效应Key words
laser-induced breakdown spectroscopy(LIBS)/magnetic field confinement/heavy metals/quantitative analysis/self-absorption effect分类
化学化工引用本文复制引用
蔡明洋,李业秋,崔建丰,邢路,赵吉,段皓..磁约束下的LIBS技术对土壤中重金属元素检测研究[J].井冈山大学学报（自然科学版）,2026,47(1):30-36,7.基金项目
国家重点研发计划项目(自然科学类)(2022YFB4601600) （自然科学类）
辽宁省教育厅高等学校基本科研项目(自然科学类)(LJ212410144009) （自然科学类）
