波长色散X射线荧光光谱法测定津巴布韦化探样品中多组分被引量：8

Determination of multi-components in geochemical exploration samples from Zimbabwe by wavelength dispersive X-ray fluorescence spectrometry

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摘要 X射线荧光光谱测化探样品中的多种元素已成为一种成熟的分析方法，适用于一般岩石、土壤和水系沉积物中主、次和痕量元素的测定。在测定津巴布韦1：250000化探样品中的多种组分时，由于样品为基性或超级基性岩，因此样品中Cr的质量分数异常，达到了0．27％～z％，同时发现Cr含量异常的样品中Mn的测定结果为负值。为解决津巴布韦异常化探样品的测定，将2个超基性岩标准物质（GBWO7101、GBW07102）及按一定比例配制的校准物质加入校准曲线，拓展了Ni、MgO、Cr的线性范围；同时采用LiF220晶体、MnKα测定Mn，或采用LiF200晶体、MnKβ线测定Mn，消除了CrNβ线对MnKα测定的干扰，进而解决了由于Cr含量异常导致Mn测定结果为负值的难题。采用经验系数法校正基体效应，方法应用于津巴布韦样品中多组分的测定，测定结果与湿法相符，相对标准偏差（RSD，n=10）在5％以下。 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 to0.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(GBW07101and 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 MnKαline,or with LiF200 crystal and MnKβline to eliminate the interference of CrKβline with the determination of MnKαline.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%.

作者李小莉何成飞高文键汤光忠

机构地区天津地质矿产研究所云南云铜锌业股份有限公司质量检验分析中心云南三环化工有限公司

出处《冶金分析》 CAS CSCD 北大核心 2016年第3期17-22,共6页 Metallurgical Analysis

基金地质大调查项目(12120113014900)

关键词 X射线荧光光谱化探样品含量异常津巴布韦超基性岩铬锰 X-ray fluorescence spectrometry geochemical exploration sample content abnormality Zimbabwe ultrabasic rock chromium manganese