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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:光谱学与光谱分析

Volume:37

Issue:10

Page Number:3011-3015

ISSN No.:1000-0593

Abstract:As an in-situ,fast and noninvasive mid-infrared spectroscopy technology,ATR-FTIR has been increasingly applied in many engineering fields,particularly in in-situ real-time measurement of the solution concentration during a crystallization process.Water is a common solvent for crystallization,which has very strong absorption peaks in the mid-infrared range but has different spectra absorbances under different temperature.Thus,the affects from water and its temperature could not be ignored in measuring the solution concentration in the mid-infrared range.Based on the Lambert-Beer's law,it is proposed in this paper to subtract the pure solvent spectra from the solution spectra under the same temperature to accurately measure the solution con-centration.Take the L-glutamic acid (LGA)solution as a case for illustration.Three calibration models were established for comparison by using the original spectra of LGA aqueous solution,the original spectra deducted uniformly by the water spectra under room temperature (25 ℃),and the solution spectra deducted by the water spectra and measured under the same tempera-ture,respectively.The results demonstrated that the proposed temperature-related differential spectra measurement method could effectively eliminate the influence of solvent on the spectra.The proposed method has a referential value for improving in-situ ATR-FTIR spectra measurement accuracy in practice.

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