Abstract：In order to improve the rapid analysis ability in field and perform the functions of small laboratory equipments, several components in conventional geological samples were directly analyzed by energy dispersion X-ray fluorescence spectrometer with powder samples. The matrix effect and spectral overlapping interference were corrected by theoretical α coefficient and Compton internal standard method. The samples were directly pulverized into 200 mesh (74 μm) followed by determination in liquid plastic case. The dosage of sample was tested with certified reference materials of geological sample. The results indicated that the determination values trended to stable or to be varied in accuracy range of certified values when more than 3.0 g of sample was used.Thus, 4.0 g of sample was used for experiments. The precision tests showed that the relative standard deviations (RSD, n=12) of La, Ce, Sn, W, U and Na2O were higher than 10%, while the RSDs of other components were less than 10%. Especially the RSDs of Ti, Mn, Co, Rb, Sr, SiO2, K2O, CaO and Fe2O3 were less than 1%. The proposed method was verified with the certified reference materials which were not used for regression. According to the supplemental provisions of samples analytical requirements norm for geochemical reconnaissance (scale of 1∶50 000), the proposed method could be used for the quantitative analysis of 19 components in conventional geological samples (including Ti, V, Mn, Co, Ni, Cu, Zn, Ga, As, Rb, Sr, Y, Zr, Nb, Th, U, K2O, CaO and Fe2O3), the approximately quantitative analysis of Ce and W, and the semi-quantitative analysis of Cr, La, Sn, SiO2 and Na2O. The sample could be put into liquid plastic case for measurement without sample preparation. Therefore, the proposed method was applicable for analysis in field.
龚仓. 直接粉末进样-能量色散X射线荧光光谱法测定地质样品中多种组分[J]. 冶金分析, 2017, 37(3): 21-28.
GONG Cang. Determination of multi-components in geological samples by energy dispersive X-ray fluorescence spectrometry coupled with direct powder introduction. , 2017, 37(3): 21-28.
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