用激光诱导击穿光谱快速分析油漆中的重金属含量
Rapid analysis of heavy metals in paints with laser-induced breakdown spectroscopy
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摘要: 将电光调Q Nd：YAG激光脉冲聚焦于油漆样品表面以产生激光诱导等离子体。等离子体的光辐射经过一组透镜收集进入单色仪并由光电倍增管探测。通过对等离子体辐射光谱的研究，能够实现对油漆样品中重金属元素含量的快速定性分析。实验分析了多种市售油漆中重金属元素Pb, Cu, Cr, Mn的含量。实验表明：对于同一种类的油漆样品，在相同检测条件下，重金属元素的特征光谱线强度与元素质量分数成正比，因此利用激光诱导击穿光谱来快速分析油漆中重金属元素含量是完全可行的。Abstract: Laser-induced plasma can be generated by focusing pulses from a Q-switch Nd:YAG laser on the surface of a paint sample. The plasma emission was collected with a set of lens onto the entrance slit of a monochromator and finally detected by a photomultiplier tube. A rapid qualitative analysis of heavy metals in paints can be achieved by analysis of spectral emission of the plasma. The contents of heavy metals(Pb,Cu,Cr,Mn) in several commercial paints have been analyzed experimentally. It is demonstrated that, the spectral intensity of one element is proportional to its concentration for the same type of paint and under the same analytical condition. Thus a rapid quantitative analysis of heavy metals in paints with laser-induced breakdown spectroscopy is practical．
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Key words:
- laser-induced breakdown spectroscopy /
- paint /
- heavy metal /
- spectroscopy analysis /
- plasma
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