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利用激光诱导击穿光谱(LIBS)对溶液中的重金属元素Cr进行分析,开发一种快速、实时、在线的原位检测技术。采用1064nm的Nd∶YAG脉冲激光发生器作为光源,在相同的实验条件下,对配制的5种浓度的K2Cr2O7溶液进行击穿以产生等离子体,选取Cr的425.43nm线作为特征谱线,利用光谱仪自带的CCD探测器对谱线的LIBS信号进行收集,获得了5种浓度下Cr元素的光谱强度,建立了Cr元素谱线强度与其浓度拟合曲线。结果表明,溶液中Cr元素的浓度与其LIBS谱线强度有很好的线性关系,线性拟合决定系数达到0.9822。实验所得的结果为LIBS技术探测水质中的微量有毒金属元素提供了可行性,同时也为LIBS技术检测水质中金属元素含量提供了依据。
The laser-induced breakdown spectroscopy (LIBS) was used to analyze the heavy metal element Cr in solution to develop a rapid, real-time and in-situ detection technology. Using 1064nm Nd:YAG pulsed laser as light source, the prepared 5 kinds of solutions of K2Cr2O7 were punctured to generate plasma under the same experimental conditions. The 425.43nm Cr line was selected as the characteristic line, The own CCD detector collects the spectral LIBS signals and obtains the spectral intensities of the Cr elements at five concentrations, and establishes the fitting curve of the intensity of the Cr element line and its concentration. The results show that there is a good linear relationship between the concentration of Cr in solution and the intensity of LIBS line, and the linear fit determination coefficient reaches 0.9822. The experimental results provided the feasibility for LIBS technology to detect trace toxic metals in water, and provided the basis for LIBS technology to detect the content of metal elements in water.