钢铁中钒、钛元素的激光诱导击穿光谱定量检测

摘要

The concentrations of vanadium and titanium elements in the steel samples were quantitatively analyzed by Laser-in-duced breakdown spectroscopy technique in the present paper .The lines of V (V Ⅰ :440.85 nm) and Ti (Ti Ⅰ :334.19 nm) were chosen as the quantitative analysis spectral lines ,while spectral line of Fe (Fe Ⅰ :438.35 nm) was chosen as the internal calibration line due to it being the matrix element .Then the calibration curves of V and Ti elements were established with basic calibration method and internal calibration method respectively to quantitatively analyze the concentrations of vanadium and tita-nium elements in steel .The experimental results showed that the fitting correlation coefficient (R2 ) of vanadium and titanium el-ements are 0.987 5 and 0.990 9 when using basic calibration method ,and their maximum relative errors of measurement are 11.09% and 4% respectively ;while the fitting correlation coefficient (R2 ) of vanadium and titanium elements reachs 0.995 2 and 0.992 1 respectively when using internal calibration method ,at the same time ,the relative errors of measurement for vanadi-um and titanium elements were decreased to be lower than 4% .The results of this study demonstrated that the concentration measurement of vanadium and titanium elements in the steel was more suitable with internal calibration method in laser-induced breakdown spectroscopy .%采用激光诱导击穿光谱（LIBS）技术测量钢铁中钒、钛元素的含量。选取V Ⅰ440.85 nm和 Ti Ⅰ334.19 nm作为定量分析谱线、基体元素谱线Fe Ⅰ438.35 nm作为内标谱线，分别建立了基本定标法和内定标法的钢铁样品中V和Ti含量的光谱分析定标曲线，并将它们用于检验样品的定量分析。研究表明，V和T i基本定标曲线的拟合相关系数R2分别为0.9875和0.9909，对检验样品中V和T i元素的测定相对误差最大分别为11.1％和4.0％；而采用内定标法时， V 和 T i的拟合相关系数 R2分别达到0.9952和0.9921，对检测样品中V和T i元素的测定相对误差均可降低到4.0％以下。结果证明，采用内定标的激光诱导击穿光谱分析方法更适于钢铁样品中钒、钛含量的测定。