Determination of multi-components in geochemical exploration samples from Zimbabwe by wavelength dispersive X-ray fluorescence spectrometry
LI Xiao-li1, HE Cheng-fei1, GAO Wen-jian2, TANG Guang-zhong3
1.Tianjin Institute of Geology and Mineral Resources, Tianjin 300170,China; 2.Quality Inspection Center,Yunnan Copper Zinc Industry Co.,Ltd., Kunming 650000,China; 3. Yunnan Sanhuan Chemical Co., Ltd., Kunming 650000,China
Abstract：X-ray fluorescence spectrometry has became a mature analysis method of multi-elements in geochemical exploration samples. It is applicable for the determination of major, minor and trace elements in general rocks, soils and stream sediments. During the determination of multi-components in geochemical exploration samples (1∶250 000) from Zimbabwe, the mass fraction of Cr showed abnormality (up to 0.x%-x%) since the sample was basite or ultrabasic rocks. Meanwhile, the determination results of Mn in these samples with abnormal Cr content were negative. In order to solve the determination of abnormal geochemical exploration samples from Zimbabwe, two ultrabasic rocks certified reference materials(GBW07101 and GBW07102) and calibration samples prepared with known proportion were used to plotted the calibration curves, which broadened the linear range of Ni, MgO and Cr. Meanwhile, Mn was determined with LiF220 crystal and MnKα line, or with LiF200 crystal and MnKβ line to eliminate the interference of CrKβ line with the determination of MnKα line. As a result, the problem that the determination results of Mn were negative due to the abnormality of Cr content could be solved. The proposed method was applied to the determination of multi-components in geochemical exploration samples from Zimbabwe with matrix empirical coefficient method. The results were consistent with wet method, and the relative standard deviations (RSD,n=10) were below 5%.
张勤,樊守忠,潘宴山,等.X射线荧光光谱法测定化探样品中主、次和痕量组分[J].理化检验:化学分册,2005,41(8):547-552.ZHANG Qin,FAN Shou-zhong, PAN Yan-shan, et al.X-ray fluorescence spectrometric determination of major,minor and trace lements in geochemical samples[J].Physical Testing and Chemical Analysis Part B:Chemical Analysis,2005,41(8):547-552.
[2]
樊守忠,张勤,李国会,等.偏振能量色散X-射线荧光光谱法测定水系沉积物和土壤样品中多种组分[J].冶金分析,2006,26(6):27-31.FAN Shou-zhong,ZHANG Qin,LI Guo-hui,et al.Multi-component analysis of stream sediment and soil samples by polarized energy dispersive X-ray fluorescence spectrometry[J].Metallurgical Analysis,2006,26(6):27-31.
[3]
李小莉,张勤.粉末压片X射线荧光光谱法测定土壤、水系沉积物和岩石样品中15种稀土元素[J].冶金分析,2013,33(7):35-40.LI Xiao-li,ZHANG Qin. Determination of fifteen rare earth elements in soil,stream sediment and rock samples by X-ray fluorescence spectrometry with pressed powder pellet[J].Metallurgical Analysis,2013,33(7):35-40.
[4]
张勤,李国会,樊守忠,等.X射线荧光光谱法测定土壤和水系沉积物等样品中碳、氮、氟、氯、硫、溴等42种主次和痕量元素[J].分析实验室,2008,27(11):51-57.ZHANG Qin,LI Guo-hui,FAN Shou-zhong,et al.Study on determination of 42 major,minor and trace elements in soil and stream sediment samples[J].Analytical Laboratory,2008,27(11):51-57.
[5]
任永金.X射线荧光光谱法测定土壤样品中的24种主、次量及痕量元素[D].长春:吉林大学,2012.
[6]
张勤,白金峰,王烨.地壳全元素配套分析方案及分析质量监控系统[J].地学前缘,2012,19(3):33-42.ZHANG Qin,BAI Jin-feng,WANG Ye.Analytical scheme and quality monitoring system for China geochemical baselines[J].Earth Science Frontiers,2012,19(3):33-42.
[7]
程泽,谭玉娟,刘晓光,等.XRF 法测定高异常化探样品中的铜、铅、锌、镍[J].分析仪器,2006(1):193-196.CHENG Ze,TAN Yu-juan,LIU Xiao-guang,et al.XRF determination of Cu,Pb,Zn and Ni in highly abnormal geochemical samples[J].Analytical Instrumentation,2006(1):193-196.
[8]
Jacinta Enzweiler,Maria Aparecida Vendemiatto. Analysis of sediments and soils by X-ray fluorescence spectrometry using matrix corrections based on fundamental parameters[J].Geostandards and Geoanalytical Research,2012,28(1):103-112.
[9]
Kenichi Nakayama,Yasuhire Shibata,Toshihiro Nakamura.Glass beads/X-ray fluorescence analyses of 42 components in felsic rocks[J].X-ray Spectrometry,2007,36(1):130-140.
[10]
Xiuchun Zhan.Application of polarized EDXRF in geochemical sample analysis and comparison with WDXRF[J].X-ray Spectrometry,2005,34(4):207-212.
