基于激光诱导击穿光谱的基体效应  

Matrix effect based on laser-induced breakdown spectroscopy

作　　者：姚胤旭 邱荣[1,2] 万情 杨怡[1,2] 史晋芳[1] 王慧丽[1,2] 周强[1,2] Yao Yinxu;Qiu Rong;Wan Qing;Yang Yi;Shi Jinfang;Wang Huili;Zhou Qiang(Joint Laboratory of Extreme Conditions Material Properties,Southwest University of Science and Technology,Mianyang 621010,China;School of Mathematics and Science,Southwest University of Science and Technology,Mianyang 621010,China;Teaching and Research Support Center,Army Service Academy,Chongqing 401331,China)

机构地区：[1]西南科技大学极端条件物质特性联合实验室,四川绵阳621010 [2]西南科技大学数理学院,四川绵阳621010 [3]陆军勤务学院教研保障中心,重庆401331

出　　处：《强激光与粒子束》2023年第11期30-35,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11972313);国家自然科学基金委员会与中国工程物理研究院联合基金项目(U1530109);中国科学院光谱成像技术重点实验室基金项目(LSIT202001W)。

摘　　要：为分析和改善激光诱导击穿光谱技术(LIBS)在定量分析土壤和大米中镉(Cd)元素含量时基体效应对分析结果的影响,以CdⅡ226.502 nm谱线为分析对象,对比研究了基体种类、KCl质量分数和激发方式等对CdⅡ226.502 nm谱线强度和定量分析结果的影响规律。研究结果表明:基体主成分的化学形态和电离能是产生基体效应的主要因素,KCl作为添加剂能明显改善大米中CdⅡ226.502 nm的谱线强度,光电双脉冲激发能显著增强基体中CdⅡ226.502 nm的谱线强度、稳定性并提高信噪比。与单激光脉冲激发方式相比,在光电双脉冲激发下,SiO_(2)、土壤和大米三种基体中CdⅡ226.502 nm的检测下限分别从372、332和2874 mg·kg^(−1)降低到42、72和37 mg·kg^(−1)。To analyze and improve the matrix effect on the quantitative analysis of cadmium(Cd)concentration in soil and rice using laser induced breakdown spectroscopy(LIBS),this article takes the CdⅡ226.502 nm spectral line as the analysis object,and compares the effects of matrix type,KCl mass concentration,and excitation method on the intensity and quantitative analysis results of CdⅡ226.502 nm spectral line.The results show that the chemical form of the main components of the matrix and the ionization energy are the main factors that produce the matrix effect.KCl as an additive can significantly improve the spectral line intensity of CdⅡ226.502 nm in rice.The photoelectric double pulse excitation can significantly enhance the spectral line intensity and stability of CdⅡ226.502 nm in the matrix,and improve the signal to noise ratio.Compared with the single laser pulse excitation method,the lower detection limit of CdⅡ226.502 nm in silicon dioxide,soil,and rice matrices decreased from 372,332 and 2874 mg·kg^(−1)to 42,72 and 37 mg·kg^(−1),respectively,under photoelectric dual pulse excitation.This study has important reference value for the development of LIBS technology and its application and promotion in the field of soil and food pollution detection.

关 键 词：基体效应 化学键 电离能 原子化 等离子体参数 

分 类 号：O433.4[机械工程—光学工程]