X射线荧光光谱法快速分析盐湖粘土矿物元素含量  

Rapid Determination of Major and Trace Elements in the Salt Lake Clay Minerals by X-Ray Fluorescence Spectrometry

作　　者：王小欢[1,2] 孟庆芬[1] 董亚萍[1] 陈美达[1,2] 李武[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008 [2]中国科学院研究生院,北京100049

出　　处：《光谱学与光谱分析》2010年第3期829-833,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(40673022);中国科学院西部之光人才培养计划联合学者项目(科发人教字<2006378>)资助

摘　　要：以低压聚乙烯粉镶边垫底粉末压片法制样,用X射线荧光光谱法测定盐湖粘土矿物中主次组分含量的定量分析曲线,测量了粘土矿物中As,Mn,Co,Cu,Cr,Dy,Ga,Mo,P,Pb,Rb,S,Sr,Ba,Cs,Ta,Th,Ti,U,V,Y,Zn,Zr,MgO,K2O,Na2O,CaO,Fe2O3,Al2O3,SiO2含量。研究了各元素的谱线干扰特别是谱线的间接干扰,同时提出了元素周期表中各周期元素相互之间干扰的判别方法 使用α经验系数法及康普顿内标法校正基体效应,经对国家标准物及实际样品进行分析,测量值与标准值结果吻合。方法的检出限和准确度均满足分析要求,除了Mo,Cs,Ta 3个元素RSD较高,其他元素RSD为0.01%~5.45%。A rapid multi-element analysis method for clay mineral samples was described. This method utilized a polarized wavelength dispersive X-ray fluorescence speetrometer-Axios PW4400, which had a maximum tube power of 4 000 watts. The method was developed for the determination of As, Mn, Co, Cu, Cr, Dy, Ga, Mo, P, Pb, Rb, S, Sr, Ni, ,Cs, Ta, Th, Ti, U, V, Y, Zn, Zr, MgO, K2O, Na2O, CaO, Fe2O3, Al2O3, SiO2 and so on. Thirty elements in clay mineral species were measured by X-ray fluorescence spectrometry with pressed powder pellets. Spectral interferences, in particular the indirect interferences of each element, were studied. A method to distinguish the interference between each other periodic elements in element periodic table was put forward. The measuring conditions and existence were mainly investigated, and the selected background position as well as corrected spectral overlap for the trace elements were also discussed. It was found that the indirect spectral overlap line was the same important as direct spectral overlap line. Due to inducing the effect of indirect spectral overlap, some elements jlike Bi, Sn, W which do not need analysis were also added to the elements channel. The relative standard deviation （RSD） was in the range of 0. 01% to 5.45% except three elements Mo, Cs and Ta. The detection limits, precisions and accuracies for most elements using this method can meet the requirements of sample analysis in clay mineral species.

关 键 词：X射线荧光 谱线干扰 盐湖沉积 粘土矿物 标准物质 

分 类 号：O657.3[理学—分析化学]