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采用激光击穿光谱(LIBS)技术对土壤中的Cd元素进行了定性和定量的研究,对相关的实验参数进行了系统研究,得出聚焦透镜焦点在样品表面内2mm,累计次数为20次时,可以得到很好的实验效果与谱线强度。对样品表面通入保护气体氩气,发现在通氩气的情况下,光谱强度明显强于未通氩气时,相对标准偏差减小,稳定性得到提高。通过调整好的实验参数进行实验得到了Cd的定标曲线,其线性拟合度R=0.99155,检测限为59μg/g。这些实验结果为土壤中重金属元素实时在线检测设备的研发提供了依据。
The laser breakdown spectroscopy (LIBS) technique was used to qualitatively and quantitatively study Cd in soils. The relevant experimental parameters were studied systematically. The result showed that the focal point of the focusing lens was 2mm in the surface of the sample and the cumulative number of times was 20 , You can get a good experimental results and spectral line intensity. On the sample surface access to the protective gas argon, found that in the case of argon, the spectral intensity was significantly stronger than the lack of argon, the relative standard deviation decreased, the stability is improved. The calibration curves of Cd were obtained by adjusting the experimental parameters. The linearity of Cd was R = 0.99155 and the detection limit was 59μg / g. These experimental results provide a basis for the development of real-time on-line detection equipment for heavy metal elements in soil.