摘要
激光诱导击穿光谱(LIBS)是一种以激光为激发源的等离子体发射光谱分析技术,已有将其用于稀土元素的定量分析研究,但由于稀土矿基体差异大、元素含量低,定量分析灵敏度和准确度仍有待提高。通过使用单激光分束构造双脉冲LIBS系统,并结合偏最小二乘回归(PLSR)算法实现对稀土矿石样品中的稀土元素La、Dy、Yb和Y的定量分析。结果表明,双脉冲LIBS结合PLSR可建立更加稳定的定标模型,与常规基本定标法相比,La、Dy、Yb和Y元素的相对均方根预测误差(RMSEP)从0.0061%、0.0037%、0.0045%、0.0280%降低至0.0044%、0.0016%、0.0029%、0.0134%,平均相对预测误差(AREP)从10.88%、15.27%、6.42%、17.20%降低至6.67%、3.62%、4.10%、7.98%。因此,双脉冲LIBS结合PLSR方法可以有效地提高LIBS对稀土矿石中稀土元素的定量分析能力。
Laser-induced breakdown spectroscopy(LIBS)is a plasma emission spectroscopy analysis technique using laser as the excitation source,which has been used for the quantitative analysis of rare earth elements.However,the sensitivity and accuracy of quantitative analysis still need to be improved due to large difference in rare earth ore matrix and low element content.In this paper,a double-pulse LIBS system using a single laser beam splitting system was proposed,and combined with the partial least squares regression(PLSR)algorithm to realize the quantitative analysis of rare earth elements La,Dy,Yb and Y in rare earth ore samples.Compared with the conventional basic calibration method,the relative root mean square prediction errors(RMSEP)of La,Dy,Yb and Y elements were reduced from 0.0061%,0.0037%,0.0045% and 0.0280%to 0.0044%,0.0016%,0.0029%and 0.0134%,respectively.The mean relative prediction error(AREP)decreased from 10.88%,15.27%,6.42%and 17.20%to 6.67%,3.62%,4.10%and 7.98%,respectively.Therefore,the combination of double-pulse LIBS and PLSR method can effectively improve the quantitative analysis ability of LIBS for rare earth ores.
作者
邓志伟
郭苏彤
徐智帅
赵梓屹
卢颖
刘莉
郝中骐
DENG Zhiwei;GUO Sutong;XU Zhishuai;ZHAO Ziyi;LU Ying;LIU Li;HAO Zhongqi(Jiangxi Province Key Laboratory of Optoelectronic Information Science and Technology,Nanchang Hangkong University,Nanchang,Jiangxi 330063,China;Key Laboratory of Nondestructive Testing(Ministry of Education),Nanchang Hangkong University,Nanchang,Jiangxi 330063,China)
出处
《中国无机分析化学》
CAS
北大核心
2024年第2期183-190,共8页
Chinese Journal of Inorganic Analytical Chemistry
基金
国家自然科学基金资助项目(12064029)
江西省光电信息科学与技术重点实验室开放基金资助项目(ED202208094)
江西省自然科学基金资助项目(20202BABL202024)
南昌航空大学研究生创新专项资金资助项目(YC2021-066)。
关键词
双脉冲激光诱导击穿光谱
稀土元素
偏最小二乘回归
double-pulse laser induced breakdown spectroscopy
rare earth element
partial least squares regression
