液相基质中重金属元素激光诱导击穿光谱实验参数的优化  

Optimization of experimental parameters of LIBS of heavy metal elements in liquid matrix

作　　者：禹纯子 俞卫佳 杨超[1] 姚关心[1] 秦正波[1] 郑贤锋[1] 崔执凤[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,安徽241000

出　　处：《原子与分子物理学报》2017年第1期95-100,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金资助项目(61475001)

摘　　要：针对混合溶液中重金属元素的激光诱导击穿光谱(LIBS)测量系统,为提高测量系统的检测灵敏度,以提高混合溶液中Ca和Cr金属元素LIBS光谱线强度的信噪比为目标,对LIBS测量系统中的激光脉冲能量、液相样品流速、ICCD门宽、延时等实验参数进行了优化,得到最优化参数激光脉冲能量、样品流速、ICCD门宽、延时分别为35 m J、30 ml/min、1400 ns和2400 ns,为降低LIBS技术应用于混合溶液中痕量重金属元素的检出限提供了实验参数支撑.In the laser induced breakdown spectroscopy （LIBS） system for measuring the heavy metal elements in mixed solution, the experimental parameters such as laser pulse energy, liquid sample flow velocity, ICCD gate width, and delay were optimized with the aim to enhance the signal to noise ratio of LIBS spectra line intensity of the Ca and Cr elements in the mixed solution. The optimum parameters obtained are 35 mJ for laser pulse energy, 30 ml/min for sample flow velocity, 1400 ns for ICCD gate width and 2400 ns for ICCD gate delay respectively. These results provide experimental parameters support to reduce the limit of detection of the LIBS technology applied to quantitative analysis of trace heavy metal elements in the mixed solution.

关 键 词：激光诱导击穿光谱 液相基质 重金属元素 实验参数优化 

分 类 号：TN247[电子电信—物理电子学]