土壤重金属镍元素的X射线荧光定量分析

利用XLt793重金属分析仪,在实验室自然大气环境下获取土壤的X射线荧光,通过X射线荧光光谱法定量分析了国家标准土壤样品中Ni元素的含量。实验研究了在最佳实验条件下土壤中Ni的X射线荧光特征分析谱线,测定了Ni元素的直接校准曲线。实验结果表明,Ni元素质量分数在(50～1000)×10-6范围内,元素含量与特征谱线强度之间具有较好的线性关系;元素Ni强度分析测量的相对标准偏差(RSD)为8.60%,利用相同土壤类型进行定量分析的结果与标准值的相对偏差为4.43%;利用定标曲线对不同土壤类型进行定量分析,元素测量浓度与标准值的相对偏差为7.13%。

Quantitative Analysis of Nickel in Soil Samples Using X-Ray Fluorescence Spectroscopy

We quantitatively analyze the content of the element Ni in the Chinese national standard soil samples by the method of X-ray fluorescence spectroscopy using XLt793 metal analyzer in ambient environment of the laboratory.The direct calibration curve of Ni is measured by studying the characteristics of X-ray fluorescence of Ni in the optimal experimental conditions.The experimental results demonstrate that the relation between concentration [mass fraction(50~1000)×10-6] of Ni element and the intensity of the characteristic spectrum is well linear,and the relative standard deviation(RSD) of intensity measurement from the standard value is 8.60%.Using the soil samples of the same type the relative deviation of element analysis of concentration measurement from the standard value is 4.43%.Using calibration curves to analyze the different soil types,the relative deviation between the measured concentration and the standard value is 7.13%.