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利用Nd:YAGns脉冲激光烧蚀土壤标样,由Ar载气流将蒸发物引入到电感耦合等离子体光源,通过光谱仪和采谱系统获得原子发射光谱,测量了样品中重金属元素As、Pb、Cr、Hg和Cd的光谱强度、信背比和谱线宽度,并研究了样品蒸发量和烧蚀颗粒尺寸随实验条件的变化。结果表明,当激光输出能量从100mJ上升至700mJ时,元素的光谱强度和信背比均正比增大,谱线宽度基本不变;样品蒸发量亦随激光能量正比增加,但烧蚀颗粒尺寸增大缓慢。所以,适当增大激光输出能量可以获得更高质量的原子发射光谱。
The soil samples were ablated by Nd: YAGns laser and the evaporation was introduced into the inductively coupled plasma source by Ar carrier gas. Atomic emission spectrum was obtained by spectrometer and spectrometry system. The contents of heavy metal elements As, Pb, Cr, Hg and Cd spectra intensity, signal-to-background ratio and spectral line width, and study the sample evaporation and ablation particle size changes with experimental conditions. The results show that when the laser output energy increases from 100mJ to 700mJ, the spectral intensity and the signal-to-background ratio of the element both increase proportionally, and the width of the line basically remains unchanged. The sample evaporation also increases with the laser energy, but the size of the ablation particle increases slow. Therefore, appropriately increasing the laser output energy can obtain higher quality atomic emission spectroscopy.