应用理论α系数校正X射线荧光光谱法分析锰矿时的基体效应

Correction of Matrix Effect in XRFS Analysis of Manganese Ores by Using the Theoratical a Coefficient

在锰矿的X-射线荧光光谱分析中应用理论α系数法对其基体效应作了校正,从而使锰矿中主要及次要组分(包括Mn、Fe、MgO、Al_2O_3、SiO_2、P、S、K_2O、CaO、TiO_2、NiO、Cu、Zn及BaO等14项)的测定结果与所分析的标准物质的证书值相符。锰矿样品用四硼酸锂熔融,所得熔片用于X-射线荧光光谱分析。此外还发现,由直接灼烧锰矿试样所测得的灼烧损失值与由锰矿与四硼酸锂一起灼烧所测得的值不同且常小于后者。基于这一事实,提出了由灼烧锰矿与四硼酸锂混合物的条件下测定灼烧损失的方法,测得制备锰标准曲线的标准偏差为0.08%;测定一种矿样中锰量时其结果的相对标准偏差(n=11)为0.19%。

Theoratical α coefficient method was applied to the correction of matrix effect in XRFS analysis of manganese ores, making the results of both the major and minor componental elements, including Mn, Fe, MgO, Al2O3, SiO2, P, S, K2O, CaO, TiO2, NiO, Cu, Zn and BaO, obtained by this method, to be in conformity with the certified values of the CRM＇ s. Sample of manganese ore was fused with lithium tetraborate and the melt slice obtained was used in the XRFS analysis. It was found, in addition, that values of ignition losses obtained by direct ignition of manganese ores were different from and usually smaller than the values obtained by ignition of manganese ores together with lithium tetraborate. Based on this fact, determination of ignition loss by ignition of manganese ore together with lithium tetraborate was proposed. Value of standard deviation found in preparation of calibration curve for determination of manganese, was 0. 08 %, and value of RSD （n= 11） found in determination of manganese in an ore sample was 0.19%.