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In recent years, spectral analysis methods have developed rapidly. A key feature is the use of chemometric methods to process spectral data for performing qualitative and quantitative analysis of complex mixtures. The coupling of chemometric methods to spectroscopic techniques led to distinct advantages in speed, cost, efficiency, automation, and portability compared to the traditional methods in agriculture, food, pharmaceutical, petroleum, chemical, environmental, and medical fields. This paper comments on the review papers published during the past three years (2020–2022) on the topic of the combination of spectral and chemometric methods. The development status, existing challenges, and the future direction of this field is discussed.
Huo et al. (Fri,) studied this question.