由于用Energy-Dispersive X-Ray Fluorescence(EDXRF)测量白云鄂博矿中铈元素含量的基体效应主要来自铁和钙, 而这两个元素含量的变化非常大, 使得通常用的标样方法不适用。 以白云鄂博矿元素平均含量为基础制备一组测试样品, 采用最小二乘法线性多元拟合来确定铁、 钙对铈含量和X射线荧光光谱信号之间的线性关系系数的影响。 这样确定的系数反映了铈在测量时发出的荧光强度被铁增强和被钙吸收的基体效应, 且适用于大幅度变化的场合。 当系数被用来通过EDXRF测量白云鄂博矿中铈的含量时相对误差小于10％。

When Energy-Dispersive X-RayFluorescence(EDXRF)used for measuring cerium (Ce) content in the Bayan Obo ores, matrix effect mainly comes from iron (Fe) and calcium (Ca). Due to extensive concentration variability of the two elements, commonly employed standard sample method for matrix effect correction is invalid. To overcome the problem, testing samples were prepared based on the average contents of elements in the Bayan Obo ores, and the influence of Fe and Ca on the coefficient in a linear relationship between Ce content and XRF signal was determined by linear least squares fitting for multivariate analysis. The coefficients thus determined reflected the matrix effect on Ce emitted fluorescence from Fe emitted fluorescence and Ca absorption. When the coefficients were used in analyzing Ce content in Bayan Obo mine by EDXRF, the relative error is less than 10%.