激光与光电子学进展, 2014, 51 (8): 083001, 网络出版: 2014-07-30
集成ICCD单双脉冲LIBS对Pb溶液定量分析比较
Quantitative Analysis of Pb in Solution by Comparing Integrated ICCD Single and Double Pulse LIBS
光谱学 单、双脉冲激光诱导击穿光谱 水溶液 定量分析 spectroscopy single double pulse laser-induced breakdown spectroscopy Pb Pb solution quantitative analysis
摘要
激光诱导击穿光谱(LIBS)检测的稳定性和灵敏度不高是制约其发展的两大瓶颈问题。本实验采用集成ICCD的单、双脉冲LIBS 系统,对经滤纸富集后的Pb(NO3)2水溶液中的Pb 元素进行了分析,比较了采样门宽、积分延迟时间、双脉冲两束激光延迟时间等参数对光谱质量的影响,确定了水溶液中Pb 元素的LIBS 检测最佳实验条件,结果表明双脉冲具有更好的稳定性。在优化的实验条件下,获取了6 个含Pb 溶液浓度系列的单、双脉冲LIBS 光谱信息,建立了元素真实浓度与其光谱强度之间的关系模型,得到溶液中痕量Pb 元素的LIBS 检测限分别为15.95 μg /mL 和5.48 μg/mL 。拟合结果表明双脉冲具有较高的线性相关系数以及较好的检测灵敏度和检测精度。说明集成ICCD双脉冲LIBS 能够改善水体中重金属元素的检测效果。
Abstract
Lower detection stability and sensitivity of laser-induced breakdown spectroscopy (LIBS) restrict development of the technique. We use an integrated ICCD single and double pulse LIBS system to analyze the Pb element in Pb(NO3)2 solution enriched by the filter paper, to compare the sampling gate width, integral time delay, time delay of two double pulse laser beams and other parameters affecting the spectrum quality, and to determine the best conditions to detect Pb element in water solution by LIBS. The results show that the double pulse has better stability. Under the optimal conditions, the single, double pulse LIBS spectral information of six solution samples with different Pb concentrations is obtained, and the relationship model between the actual Pb concentration and its spectral intensity is built, showing that the LIBS detection limits of trace Pb element are 15.95 μg /mL and 5.48 μg /mL, respectively. The fitting results indicate that the double pulse has a better linear correlation coefficient, detection sensitivity and accuracy. It is suggested that the integrated ICCD dual-pulse LIBS will improve the effect on heavy metal detection in water.
杨平, 黄林, 姚明印, 陈添兵, 何秀文, 黎文兵, 郑建鸿, 胡慧琴, 刘木华. 集成ICCD单双脉冲LIBS对Pb溶液定量分析比较[J]. 激光与光电子学进展, 2014, 51(8): 083001. Yang Ping, Huang Lin, Yao Mingyin, Chen Tianbing, He Xiuwen, Li Wenbing, Zheng Jianhong, Hu Huiqin, Liu Muhua. Quantitative Analysis of Pb in Solution by Comparing Integrated ICCD Single and Double Pulse LIBS[J]. Laser & Optoelectronics Progress, 2014, 51(8): 083001.