黄连中Pb的激光诱导击穿光谱测量分析  

Laser induced breakdown spectroscopy of Pb in Coptis chinensis

作　　者：李占锋[1] 王芮雯 邓琥[2,3] 尚丽平[3,4] 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]西南科技大学信息工程学院,四川绵阳621010 [3]西南科技大学特殊环境机器人四川省重点实验室,四川绵阳621010 [4]西南科技大学极端条件物质特性联合实验室,四川绵阳621010

出　　处：《红外与激光工程》2016年第10期59-63,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(11176032);四川省教育厅青年基金(12ZB337);极端条件物质特性实验室资助课题(13zxjk02)

摘　　要：黄连是一种清热解毒的传统中药,在生长过程中对重金属元素有较强的富集作用。为了能够对中药内重金属元素进行快速鉴别,以铅元素(Pb)为例,采用激光诱导击穿光谱技术(LIBS)对其进行检测。实验以Nd:YAG固体脉冲激光器作为激发光源,八通道光谱仪进行光谱采集,选用特征谱线Pb 405.7 nm进行分析,得到了实验条件下的最佳激光能量为60 m J,最佳延迟时间为1μs。对6种不同浓度的样品在最佳实验条件下进行定量分析,拟合出光谱强度和浓度的定标曲线,线性拟合度R2=0.976。计算出检测限为0.19%。通过实验结果可得出结论 :LIBS可用于黄连Pb污染的快速判定,对于中药材重金属污染快速检测有极大潜力。The Coptis chinensis is one of the traditional Chinese medicine, which has the property of clearing heat and expelling toxi. It has the strong enrichment effect on the heavy metal during the growth process. In order to quickly identify the heavy metal elements in traditional Chinese medicine, taking Pb as an example, used laser induced breakdown spectroscopy （LIBS） as the detection method to detect it. The experiment took the Nd：YAG solid pulse laser as the excitation light source, eight channel spectrometer for spectral collection, the characteristic spectrum fine Pb 405.7 nm was used for analysis. The following results were obtained through experiments. The optimal laser energy of the experimental condition is 60 mJ, and the optimal delay time is 1 μs. The quantitative analysis was carried out on 6 different concentrations of samples under the optimum experimental conditions, and the calibration curves of the spectral intensity and concentration were fitted. The results show that the linear fitting degree R2=0.976, and the detection limit is 0.19%. The following conclusions can be drawn from the experimental results, LIBS can be used for the rapid determination of Pb pollution in Coptis chinensis, and LIBS also has great potential for rapid detection of heavy metals in traditional Chinese medicine.

关 键 词：激光诱导击穿光谱技术 中药 黄连 重金属 定标曲线 

分 类 号：O434.3[机械工程—光学工程]