Applicability of Portable XRF for Analysis of Carbonate Weathered Crust Soils in Karst Regions of Southwest China
A portable X-ray fluorescence spectrometer(pXRF)was applied to analyze carbonate weathered crust soils in the karst re-gion of southwest China.The results were then compared with those obtained via conventional laboratory methods aiming to determine the data quality of the analytical results for 20 elements,and to investigate the effect of detection time and particle size on the analytical precision.We investigated the relationship between the detection time and the particle size as well as its analytical precision.Further-more,a mode for carbonate weathered crust soils in pXRF was constructed to evaluate the applicability of pXRF in order to analyze the calcareous soils.The main results were that 1)pXRF has a good potential to analyze carbonate weathered crust soils;2)the detection time of 120 s allowed a good balance between precision and efficiency;3)the data quality of Cu,Nb,Ba,Ce and Th was improved when the particle size was reduced from 10 to 200 mesh and the remaining 15 elements were unaffected;4)The carbonate weathered crust soil mode significantly improved the potential of pXRF to analyze calcareous soils,but still has a low applicability to clastic and basalt weathering crust soils.The soils in the karst regions of southwestern China are highly heterogeneous.Thus,it is difficult for a single testing mode to meet the highly diverse analytical tasks.It is therefore urgent to construct detection modes for different types of soils to improve the analytical accuracy and give full play to the superior performance of pXRF,as a result helping soil geochemical a-nalysis in karst regions of southwesten China.Meanwhile,this paper also delivers a new concept for optimizing the analytical applica-bility of pXRF.
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