在实验室条件下, 利用NITON XLt793型便携式X射线荧光光谱重金属分析仪测量并分析土壤中铅元素的X射线荧光光谱特性。 分别以铅的Lα(10.55 keV)和Lβ(12.61 keV)特征谱线作为分析线, 分析了不同基体元素对分析线的影响; 测定在不同铅浓度下的特征谱线强度变化。 结果表明铅的质量分数在10×10-6～1 800×10-6范围内, 元素的光谱强度与浓度之间呈现较好的线性关系; 建立了铅元素的定标曲线, 并计算得到铅的检出限为7.89×10-6。

The present paper analyzed the characteristics of X-ray fluorescence spectroscopy (XRF) of metal element lead in soil using the NITON XLt793 portable X-ray fluorescence spectra of heavy metal analyzer under laboratory conditions. The characteristic spectral lines of Lα (energy: 10.55 keV) and Lβ(energy: 12.61 keV) with different matrix elements were selected respectively for lead in the experiment. By measuring the intensities of the characteristic spectral line with different Pb concentration, the results demonstrate that the relation between concentration ［mass fraction 10×10-6～1 800×10-6］ of Pb element and the intensity of the characteristic spectrum is well linear. The calibration curve of Pb was plotted based on the different concentration measurement results, and the limit of detection of 7.89×10-6 was obtained for Pb in soil.