激光诱导击穿光谱(LIBS)法微损快速检测党参中Pb

中药材重金属元素快速检测对污染监控及人们健康具有重要意义。激光诱导击穿光谱技术(Laser Induced Breakdown Spectroscopy, LIBS)属于一种快速检测方法,研磨压片等预处理方法相对样品消解已有所简化,但破坏了样品的物理性质,且不能满足中药材大宗品种、大批量检测需求。若进一步简化样品预处理,将更加凸显LIBS快速检测的优势。本文建立了激光诱导击穿光谱技术(LIBS)快速微损检测中药材样品重金属元素定标方法。线性相关系数R2为0.7764,建立的微损定标曲线线性可用于切片党参LIBS快速检测,对待测党参切片样品检测平均相对误差为3.74%,与电感耦合等离子体质谱法(ICP-MS)对比,相关系数R2为0.7957,验证了LIBS技术微损检测的可行性。制备的党参参考定标样品可多次重复用于待测样定标和仪器标定等。实验对待测党参样品仅进行切片处理,避免了研磨、压片等预处理,更加充分地体现LIBS快速检测的优势,为LIBS技术应用于中药材重金属元素快检等领域提供了一种新方法。

Rapid detection of Pb in Codonopsis codonopsis by laser induced breakdown spectroscopy (LIBS)

Rapid detection of heavy metal elements in Chinese medicinal materials is of great significance to pollution control and people"s health. Laser Induced Breakdown Spectroscopy (LIBS) is a rapid detection method. Compared with sample digestion, pretreatment methods such as grinding and pressing have simplified the physical properties of samples, but they can not meet the requirements of large-scale varieties and large quantities of Chinese medicinal materials. If the sample pretreatment is further simplified, the advantages of LIBS rapid detection will be more prominent. In this paper, a laser induced breakdown spectroscopy (LIBS) method was developed for rapid micro-damage detection of heavy metal elements in Chinese medicinal materials. The linear correlation coefficient R2 was 0.7764, and the linearity of the established micro-loss scaling curve could be used for the rapid detection of Codonopsis LIBS. The average relative error of Codonopsis LIBS detection was 3.74%, and the correlation coefficient R2 was 0.7957 when compared with inductively coupled plasma mass spectrometry (ICP-MS). The feasibility of micro-damage detection by LIBS technology is verified. The prepared reference calibration sample of Codonopsis codonopsis can be repeated for sample calibration and instrument calibration. The experimental treatment of Codonopsis Codonopsis samples was only sliced, avoiding pretreatment such as grinding and tablet pressing, more fully reflecting the advantages of LIBS rapid detection, and providing a new method for the application of LIBS technology in the field of rapid detection of heavy metal elements in Chinese medicinal materials.