基于激光诱导击穿光谱技术的金属基体辅助测量研究

为了降低土壤中基体效应对激光诱导击穿光谱技 术(Laser-induced breakdown spec troscopy,LIBS)定量分析的影响,采用了Cu、Al、Zn三种金属作为基体辅助LIBS检测土壤 中的重金属元素。以Cd I 288.08 nm为特征谱线进行定量分析,得到 了三种金属基体的原子 谱线图,计算出等离子体特征参数。相比于压片条件,在三种金属基体辅助条件下的谱线强 度均有明显的增强,定标曲线拟合系数R²都在0.97以 上,且相对标准偏差RSD低于7%。实验 结果表明采用金属基体辅助LIBS检测的方法,提高了LIBS在土壤重金属检测的灵敏度,这对 土壤中重金属元素的检测具有重要意义。

Research on metal matrix-assisted measurement based on laser-induced breakdown spectroscopy

In order to reduce some of the influence of the matrix effect in the soil on the quantitative analysis of laser-induced breakdown spectroscopy (LIBS ) .Three metals with high purity,Cu,Al and Zn are used as the matrix to assist t he detection of heavy metal elements in the soil by laser-induced breakdown spe c troscopy.First of all,Taking Cd I 288.08nm as the characteristic spectral line for quantitative analysis,after data fitting,the atomic spectral diagrams of t he three metal substrates are obtained,and the plasma characteristic parameters are calculated by the spectral diagrams and related parameters.It can be obtain ed from the data that compared with the tableting conditions,the spectral line intensity under the auxiliary conditions of the three metal substrates is signif icantly enhanced,the calibration curve fitting coefficient R^2is all above 0.97,And the relative standard deviation (RSD) is all below 7%,the element detect ion limit has also been reduced.Finally,the experimental results show that the u se of metal matrix-assisted LIBS detection method will increase the sensitivity of LIBS in the detection of heavy metals in the soil and reduce the detection li mit,which is of great significance for the detection of heavy metals in the soi l.