Comparative Study on the 2 Methods for Preparation of Sample Discs in XRFS Analysis of Carbonates

In the XRFS analysis of carbonates, a comparative study was made between the methods of preparation of sample discs by the fusion method and by the method of pressure-disking of super-fines (PDSF) in 3 aspects. As shown by the results: ① in the determination of 15 components in carbonate samples, values of detection limits were significantly improved with sample disc prepared by PDSF since no dilution of sample by additives was encountered; ② although higher precision of analytical results of major and minor components were obtained for sample disc prepared by the fusion method, but better precision of results was obtained for trace constituents with sample disc prepared by the PDSF method; and ③ as no escaping of CO2 was observed and the particls size effect was eliminated in the process of PDSF, quantitative determination of CO2 in carbonates was realized by using sample disc thus prepared.