大气颗粒物中的重金属对人体健康具有巨大危害,对其中的重金属元素进行快速检测具有重要意义。利用激光诱导击穿光谱技术对大气颗粒物样品中的重金属元素进行快速分析,结果显示在大气颗粒物样品中含有Na、Al、Si、Cu、Mg、Fe等元素。以Ca元素为参考元素,采用内标法对大气颗粒物中的Pb元素进行定量分析,通过拟合得到定标曲线,计算出Pb元素的检出限为34.3×10 ^-6。分析了Pb元素的等离子体温度、电子数密度等相关特性。实验结果验证了LIBS技术用于大气颗粒物中重金属元素定性与定量分析的可行性,为监测大气颗粒物重金属污染提供了实验依据。

The heavy metal in atmospheric particulates has great harm to human health, and the rapid detection of heavy metal elements therein is important. The laser-induced breakdown spectroscopy (LIBS) is applied to the rapid elemental analysis of atmospheric particulates, and the results show that atmospheric particulates contain Na, Al, Si, Cu, Mg, Fe and other elements. Taking Ca element as the reference element, we use the internal standard method to quantitatively analyze Pb element in the atmospheric particles. The calibration curve is obtained by fitting, and it is calculated that the limit of detection of Pb element is 34.3×10 -6. Besides, the plasma temperature and electron number density of Pb element are calculated. The experimental results verify the feasibility of LIBS for the qualitative and quantitative analysis of heavy metal elements in atmospheric particulates and provide experimental evidence for monitoring atmospheric heavy metal pollution.