锰的价态研究及在X射线荧光光谱测定锰矿中的应用

Study on chemical valence of manganese and its application in X-ray fluorescence spectrometry determination of manganese ore

研究了锰矿样品中Mn的价态,发现样品单独灼烧后Mn的价态和Mn3O4相同,而在熔片中和MnO相似,由此确定了锰矿测量中灼烧减量的测定方法与基体效应校正时Mn的价态之间的关系,建立了X射线荧光光谱测定锰矿中主次成分的方法。本法的分析结果与多个标准物质的认定值和水平测试的中位值相吻合。锰矿中主要成分的相对标准偏差(n=7)均在2%以下,Mn和Fe的相对标准偏差分别为0.20%和0.16%,能满足锰矿中成分测定的要求。

The chemical valence of manganese in manganese ore sample was studied.It was found that,the chemical valence of manganese in singly-ignited sample was the same to Mn3O4 and similar to MnO in fused piece.Accordingly,the relationship between the determination method of loss on ignition and the chemical valence of manganese in matrix effect correction was identified.A X-ray fluorescence spectrometric determination method of major and minor components in manganese ore was established.The analytical results of this method were in good agreement with the certified values and the mean value of parallel tests of several certified reference materials.The relative standard deviations（RSD,n=7） of main components in manganese ore were smaller than 2 %.The RSD of Mn and Fe was 0.20 % and 0.16 %,respectively,which could meet the determination requirements of components in manganese ore.