基于LIBS技术对4种珍宝藏药快速多元素分析

采用激光诱导击穿光谱(LIBS)技术对4种珍宝藏药仁青芒觉、仁青常觉、二十五味珊瑚丸和二十五味珍珠丸进行元素定性研究,建立4种珍宝藏药的元素特征图谱。实验采用Nd:YAG和基频1 064 nm的脉冲激光器;激光光束聚焦待测样品表面产生等离子体,采用光谱仪探测其光谱信号。基于美国国家原子光谱标准与技术(NIST)数据库,对LIBS谱线进行辨识。4种珍宝藏药主要含有Ca,Na,K,Mg等,同时检测到C-N分子谱带。其中,在仁青常觉和二十五味珍珠丸中检测到Fe;仁青常觉和仁青芒觉中检测到重金属Cu,Hg;仁青常觉中检测到Ag。结果表明,LIBS提供了4种珍宝藏药的可靠、快速多元素分析;LIBS具有实时、快速、近似无损的优势,该技术在民族药物的元素检测,具有广阔的应用前景。

Rapid multi-elemental analysis on four precious Tibetan medicines based on LIBS technique

The laser-induced breakdown spectroscopy (LIBS) was applied to perform a qualitative elementary analysis on four precious Tibetan medicines, i.e. Renqing Mangjue, Renqing Changjue, 25-herb coral pills and 25-herb pearl pills. The specific spectra of the four Tibetan medicines were established. In the experiment, Nd:YAG and 1 064 nm-baseband pulse laser were adopted to collect the spectra. A laser beam focused on the surface of the samples to generate plasma.Its spectral signal was detected by using spectrograph. Based on the National Institute of Standard and Technology (NIST) database, LIBS spectral lines were indentified. The four Tibetan medicines mainly included Ca, Na, K, Mg and other elements and C-N molecular band. Specifically, Fe was detected in Renqing Changjue and 25-herb pearl pills; heavy mental elements Hg and Cu were shown in Renqing Mangjue and Renqing Changjue; Ag was found in Renqing Changjue. The results demonstrated that LIBS is a reliable and rapid multi-element analysis on the four Tibetan medicines. With Real-time, rapid and nondestructive advantages, LIBS has a wide application prospect in the element analysis on ethnic medicines.