Abstract：The portable X-ray fluorescence spectrometry (PXRF) is one of methods for the determination of elemental content in soil. However, the determination results can be affected by the water content in soil.Therefore, the empirical study about the influence of water content in soil should be conducted. The beneficial elements (K, Ca, Fe and Mn) and harmful elements (Cr, Ni, Zn, Pb and Cu) in soil samples with different water contents were analyzed using portable X-ray fluorescence spectrometer (PXRF). The influence of water content on determination results was discussed. The results were compared to those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). It was found that PXRF had different sensitivities to different elements. For the elements with high content in soil sample such as K, Ca, Fe and Mn, the measured results of elemental content by PXRF decreased with the increase of water content in soil. Moreover, the water content showed significant influence on the measured results by PXRF. When the water content was not higher than 0, 0.20, 0.10 and 0.10mL/g, there was no significant difference between the analysis results by PXRF and ICP-AES, respectively. For the elements with relatively low content in soil such as Cr, Ni, Zn, Pb and Cu, the analysis results of PXRF was slightly affected by the water content. The analysis results firstly decreased and then were almost changeless with increasing water content in soil. When the water content was not higher than 0.20, 0 and 0.10mL/g, the analysis results of Cr, Zn and Pb had no significant difference between PXRF and ICP-AES, respectively. For Cu, all ICP-AES results were much higher than PXRF results. When the water content was in range of 0-0.10mL/g, there was no significant difference for analysis results by PXRF. After that, the analysis results greatly decreased, but the influence of water content was not significant any more. The PXRF results of Ni were basically not affected by the water content. But they were much higher than the ICP-AES results when the water content was in range of 0-0.15mL/g. Therefore, the water conditions in soil should be considered during the rapid determination of heavy metals in soil by PXRF in the field.
赵霞, 郑景明, 司莉青, 孙海龙, 王靖. 水分对于便携式X射线荧光光谱仪测定土壤中元素含量的影响[J]. 冶金分析, 2018, 38(7): 20-26.
ZHAO Xia, ZHENG Jing-ming, SI Li-qing, SUN Hai-long, WANG Jing. Influence of water content on the determination of elements in soil by portable X-ray fluorescence spectrometry. , 2018, 38(7): 20-26.
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