基于单激光构造的DP-LIBS对钽铌矿的检测研究

Detection of Tantalum-Niobium Ores Using Double-Pulse Laser-Induced Breakdown Spectroscopy Based on a Single Laser

钽铌矿中Ta和Nb元素含量极低,采用常规激光诱导击穿光谱(LIBS)技术面临检测灵敏度不足的问题,双脉冲LIBS技术可显著改善分析灵敏度,但设备成本高。为此,提出一种基于单激光分束构造的双脉冲激光诱导击穿光谱(DP-LIBS)技术对钽铌矿中Ta和Nb元素进行高灵敏度检测。在对离焦量、采集延时、激光能量等实验参数优化的基础上,建立了LIBS定量分析模型。结果表明:所提的DP-LIBS系统对Ta和Nb元素特征谱线强度比单脉冲LIBS增强3~4倍,检测灵敏度提高约2倍,Ta和Nb元素检出限分别达到195.91μg·g^(-1)和81.79μg·g^(-1)。为钽铌矿痕量Ta和Nb元素的快速高灵敏度定量分析提供了一种有前景的检测方法。

The extremely low Ta and Nb content in tantalum-niobium ores affects the sensitivity of conventional laserinduced breakdown spectroscopy(LIBS)techniques.Although the double-pulse LIBS technique offers a significantly improved analytical sensitivity,it suffers from a high equipment cost.Therefore,a double-pulse laser-induced breakdown spectroscopy(DP-LIBS)technique based on a single laser beam splitting configuration is proposed for the high-sensitivity detection of Ta and Nb elements in tantalum-niobium ores.A quantitative LIBS analysis model is developed based on the optimization of experimental parameters such as the distance from the focal point,acquisition delay,and laser energy.The results show that the proposed DP-LIBS system enhances the intensity of the characteristic spectral lines of the Ta and Nb elements by 3‒4 times compared with single-pulse LIBS,and increases the detection sensitivity by approximately 2 times,where the detection limits of the Ta and Nb elements are 195.91μg·g^(-1) and 81.79μg·g^(-1),respectively.Therefore,the proposed technique is a promising method for the rapid and highly-sensitive quantitative analysis of trace elements of Ta and Nb in tantalum-niobium ores.