Study on a modified spectral standardization method and quantitative analysis of cement based on microwave plasma torch

Abstract

In this study, we used a powder aerosol generator (PAG) to introduce cement powder aerosol directly into a microwave plasma torch (MPT) for quantitative analysis, which demonstrated the feasibility of MPT for the analysis of cement powder. Meanwhile, we proposed a modified spectral standardization method (MSS-method) in which the Saha equation is used to characterize the electron number density, and obtain better results compared to the raw data. The measurement uncertainty of the five major oxides (Fe₂O₃, CaO, Al₂O₃, SiO₂, MgO) in cement was reduced, while the accuracy of calibration and validation were both significantly improved. The proposed method was validated by analyzing the GSB 08-2985-2013 certified reference material. The study demonstrates that this method has the potential for application in online cement analysis.