Chemometrics applied quantitative analysis of iron oxide mixtures byterahertz spectroscopy

作者：Ying Li, Tianyao Zhang, Zhao-Hui Zhang, Jianfeng Yan, Xuan Zhao, Xiaoyan Zhao, Xingyue Li, Xianhao Wu, Lu Yin, Yuan Yuan, Jianmei Guo · 发表于：Applied Optics · 年份：2023 · DOI：10.1364/ao.481383 · 被引用次数：5 · 研究领域：Terahertz technology and applications、Spectroscopy and Laser Applications、Plant and animal studies

A quantitative analysis method for corrosion products based on terahertz spectroscopy is proposed in this paper. Mixture samples consisting of three major corrosion products (magnetite, hematite, and goethite) were prepared in 51 different concentrations. The refractive index spectra measured by terahertz time-domain spectroscopy were projected to the 2D score diagram by performing principal component analysis. The Euclidean distances between the mixtures and pure analyte on the diagram were used to build a concentration prediction model. The results indicate that the established model can precisely predict the concentration of magnetite, which is essential for a stability evaluation of the corrosion system.