X射线荧光光谱法测定镍铬合金中15种元素

建立了X射线荧光光谱法测定镍铬合金中镍、铬、钼、磷、硫、钒、铝、硅、锰、铜、钛、铌、钴、铁、钨的快速检测方法，采用二元合金样品求得的校正系数对镍铬合金中元素间的谱线重叠干扰进行校正，理论α系数校正元素间的吸收和增强效应。试验了不同的砂带粒度和材质研磨样品时对元素测定的影响，结果表明砂带的粒度影响测定结果的准确性，使用含有待测元素材质的砂带会导致该元素测定结果偏高，因此实验时应确保建立校准曲线的标准样品和待测样品的表面处理条件一致，此外，还应考虑使用的砂带材质是否对测定元素有污染。方法用于测定镍铬合金中镍、铬、钼时的相对标准偏差(RSD，n=11)分别为0.15％、0.17％、0.22％，其他元素均显示较好精密度；测定值与其他方法测定结果显示较好的一致性。

Determination of fifteen elements in nickel-chromium alloy by X-ray fluorescence spectrometry

The rapid determination method of Ni, Cr, Mo, P, S, V, Al, Si, Mn, Cu, Ti, Nb, Co, Fe and W in nickel-chromium alloy by X-ray fluorescence spectrometry was established. The spectral overlapping interference among the elements in nickel-chromium alloy was corrected by correction coefficients obtained from binary alloy samples. The absorption and enhancement effect among the elements was corrected by theoretical α coefficient method. The effect of grinding sample with various abrasive belt granularities and materials on the determination was tested. The results showed that, the accuracy of determination results were affected by the granularity of abrasive belt. The found results would be higher when the abrasive belt containing test elements was used. Therefore, the surface treatment conditions of reference materials for preparing calibration curves should be consistent with those of samples. The pollution of abrasive belt materials on test elements should be considered. The proposed method was used for the determination of 15 elements in nickel-chromium alloy. The relative standard deviation (RSD, n=11) of Ni, Cr and Mo was 0.15%, 0.17% and 0.22%, respectively. The precision of other elements was good. The found results were consistent with those obtained by other methods.