选用混合熔剂(Li2B4O7-LiBO2-LiF)熔融制样，用X射线荧光光谱仪对锰矿样品中的Mn、TFe、SiO2、Al2O3、CaO、MgO、K2O、Na2O、TiO2、P、S、BaO、Cu、Co、Ni、V、As等17种主次组分进行测定。以NH4NO3为氧化剂、Li2CO3为保护剂可使锰矿中的S与As在预氧化时转化为稳定的盐形式，从而防止S、As在熔样过程中的挥发损失。加入Cr2O3做Mn的内标可消除基体效应对Mn测定的影响。对锰矿石合成标样进行精密度考察，相对标准偏差(RSD，n=12)均小于10%：对锰矿石标准样品及合成样品进行准确度考察，测定值与认定值或湿法测定值一致。
Abstract
After the sample was melted with mixed flux (Li2B4O7-LiBO2-LiF), seventeen major and minor components in manganese ore, including Mn, TFe, SiO2, Al2O3, CaO, MgO, K2O, Na2O, TiO2, P, S, BaO, Cu, Co, Ni, V and As, were determined by X-ray fluorescence spectrometry. S and As could be converted to stable salt during pre-oxidation with NH4NO3 as oxidizing agent and Li2CO3 as protective agent. Consequently, the volatilization loss of S and As in sample preparation by fusion could be prevented. Cr2O3 was added and used as internal standard for Mn to eliminate the matrix effect on the determination of Mn. The precision test was performed with manganese ore synthetic reference samples. The relative standard deviation (RSD, n=12) was less than 10%. The accuracy test was conducted with manganese ore reference samples and synthetic samples. The results were consistent with the certified values and those obtained by wet method.
关键词
X射线荧光光谱 /
熔融制样 /
锰矿石
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Key words
X-ray fluorescence spectrometry /
fusion sample preparation /
manganese ore
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中图分类号：
O657.34
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