液相基质中微量金属元素Pb的激光诱导击穿光谱研究

摘要

通过单脉冲激光诱导击穿光谱技术(LIBS),测定了Pb(NO3)2水溶液中微量重金属元素Pb的LIBS光谱.实验研究溶液中Pb元素的LIBS光谱信号的时间(300 ns-1300 ns)演化特性,得到了本实验的优化实验条件,光谱探测相对激光的延时为800 ns,单脉冲激光能量35 mJ.在最佳实验条件下测得Pb微量元素的LIBS定标曲线,计算得到单脉冲LIBS用于Pb(NO3)2水溶液中微量金属元素分析的检测限177 ppm.%The LIBS of trace heavy metal element lead in Pb(NO3)2solution was measured by the single-pulse laser technique. The time evolution properties (300 ns-1300 ns)of the heavy metal element Pb LIBS signal were investigated,The optimum experimental conditions were obtained, The time delay is about 800ns and the suitable ablation laser energy is 35 mJ for the solution of Pb(NO3)2. Under the optimum condition we measured the LIBS calibration curves for Pb in solutions and obtained the LIBS detection limit(LOD) with the values 177 ppm for Pb from the fitting of the calibration curve.