纤维素衬层压片-X射线荧光光谱法测定砂岩型铀矿中9种主次元素

目的是采用粘结性强、腐蚀性低有机纤维素替换粉末压片法中硼酸衬层,降低硼酸衬层在样品分析过程中受热挥发,分散的硼酸粉末附着于仪器金属部件、滤光片、准直器,硼酸粉尘累积,增加仪器维护保养成本甚至会影响仪器运行和检测结果等不良影响。方法研究其有机纤维素作为衬层可能性及对样品检测结果的影响,微晶纤维粉改善砂岩型铀矿样品的过程中会出现样品粘结性差、分层和裂纹的效果。结果该方法测定砂岩型铀矿中9种主次元素的精密度(RSD,n=11)为0.34-4.76%,准确度为0.06-5.52%,相较于硼酸衬层和未添加辅助粘结剂样品的测定值,应用格拉布斯法检验各元素统计量G均在1.25-1.40%之间。结论采用羟甲基纤维素作为衬层可用于砂岩型铀矿中主次元素的测定,添加微晶纤维素0.5g可改善矿石粘结性能,提升实验制备样片的稳定性,降低了样品分析对仪器金属部件及检测效果的影响。

Determination of nine primary and secondary elements in sandstone-type uranium deposits by X-ray fluorescence spectrometry

The purpose is to replace the boric acid lining in powder laminating method with strong adhesion and corrosive low organic cellulose, reduce the boric acid lining volatilized by heat in the sample analysis process, dispersed boric acid powder attached to the instrument metal parts, filter, collimator, boric acid dust accumulation, increase the maintenance cost of the instrument and even affect the operation of the instrument and test results and other adverse effects. Methods The possibility of organic cellulose as lining layer and its influence on the sample test results were studied. In the process of improving the sandstone-type uranium ore sample with microcrystalline fiber powder, there would be poor cohesiveness, delamination and cracks of the sample. Results The precision (RSDS,n=11) of the nine primary and secondary elements in sandstone-type uranium ore was 0.34-4.76%, and the accuracy was 0.06-5.52%. Compared with the determination values of boric acid lining and samples without auxiliary binder, the statistics G of each element were all between 1.25-1.40% by Grubs method. Conclusion The use of hydroxymethyl cellulose as lining can be used for the determination of primary and secondary elements in sandstone type uranium ore. Adding 0.5g microcrystalline cellulose can improve the bonding property of ore, improve the stability of the sample prepared by experiment, and reduce the influence of sample analysis on the metal parts of the instrument and the detection effect.