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实验利用1064nm Nd:YAG纳秒激光器诱导击穿脐橙样品产生等离子体光谱,用八通道光纤光谱仪测量脐橙的激光诱导击穿光谱(LIBS)特性,通过鉴别分析,选取铅的(PbI 405.78nm)特征谱线作为分析线,测定不同铅浓度下的特征谱线强度,根据谱线强度与浓度的关系,建立定标曲线。实验结果表明,脐橙中重金属铅元素含量较低时,其光谱谱线强度与浓度呈线性关系,其拟合度为0.95;脐橙中重金属铅元素含量较高时,等离子体发射光谱的谱线存在自吸收现象,使其定标曲线向下偏移趋势,呈现曲线关系,其拟合度为0.98。LIBS技术还可以快速分析出水果样品中重金属元素的相对含量,能实际应用于与食品安全相关的领域。
In the experiment, the plasma spectra were induced by 1064nm Nd: YAG nanosecond laser induced breakdown of navel orange, and the laser-induced breakdown spectroscopy (LIBS) of navel orange was measured by octa-fiber optical spectrometer. The lead (PbI 405.78nm) The spectral line is used as the analytical line to determine the intensity of the characteristic spectral line at different lead concentrations. Based on the relationship between spectral intensity and concentration, a calibration curve is established. The experimental results showed that when the lead content in the navel orange is low, the linearity of the spectral line intensity is linear with the concentration, and the fitting degree is 0.95. When the lead content in the navel orange is high, the spectrum of the plasma emission spectrum exists Self-absorption phenomena, the calibration curve downward trend, showing a curve relationship, the fitting degree of 0.98. LIBS technology can also quickly analyze the relative contents of heavy metal elements in fruit samples and can be actually applied in the field related to food safety.