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[1]ZHANG Mingyang,ZHU Zhaolong,LI Haohao,et al.Comparison and Application of Different Fourier Transform Infrared Spectroscopy to Soil Spectral Characteristics Analysis[J].Research of Soil and Water Conservation,2022,29(06):121-128.

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Comparison and Application of Different Fourier Transform Infrared Spectroscopy to Soil Spectral Characteristics Analysis

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 121-128 Column: Public date: 2022-10-20

Title:: Comparison and Application of Different Fourier Transform Infrared Spectroscopy to Soil Spectral Characteristics Analysis

Author(s):: ZHANG Mingyang¹, ZHU Zhaolong¹, LI Haohao³, FENG Chenglong¹, AN Shaoshan^1,2; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling, Shaanxi 712100, China; 3.College of Natrual Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: Fourier transform infrared; transmission spectrum; attenuated total reflection spectrum; diffuse reflection spectrum; soil spectrum

CLC:: S151.9⁺5

DOI:: -

Abstract:: In order to better apply Fourier transform infrared spectroscopy technology to the quantitative analysis of functional groups in soil, three differences of soil characteristic absorption peaks under three Fourier transform technologies were compared to select the optimal spectral technology to be applied to the related research of soil. Transmission(T-FTIR), Attenuated Total Reflectance(ATR-FTIR)and Diffuse Reflectance(DR-FTIR)were used to test and analyze organics(Benzoic Acid and Stearic Acid)and soil samples(Quercus Liaotungensis), and mixed Quercus Liaotungensis and grassland soil samples in different proportions. T-FTIR and DR-FTIR were used to determine the spectrums of mixed soil samples for quantitative analysis. The results show that:(1)characteristic absorption peaks of organics were found in all three spectral techniques. Benzoic acid showed characteristic peak of benzene ring C=C skeleton at 1 600～1 400 cm^-1, searic acid showed characteristic peak of methyl at 2 900～2 800 cm^-1; carbonyl-C=O in carboxylic acid-COOH in organic matter, the stretching vibration absorption peak appeared at 1 720～1 680 cm^-1, hydroxyl -OH had in-plane and out of plane bending vibration absorption peaks near 1 430～1 410 cm^-1 and 940～930 cm^-1, respectively; organics reagents needed to be diluted with potassium bromide(KBr)in the T-FTIR technique;(2)the soil samples of Quercetissima Liaotunica were tested by T-FTIR and DR-FTIR techniques, and there were many effective characteristic absorption peaks in the soil spectrums; the soil samples also needed to be diluted by KBr and distributed evenly in the ingot in T-FTIR technique; however, only a few effective characteristic absorption peaks appeared in ATR-FTIR test, which was not conducive to the identification and further analysis of soil spectrum;(3)the result that soil samples of Quercus Liaotungensis and grassland were mixed in different proportions showed that there was a positive correlation between mass fraction and peak area ratio in T-FTIR and DR-FTIR tests, and the vaulues of R² linear fitting were 0.70 and 0.88, respectively. Among the three different infrared technologies of soil, DR-FTIR spectrum has good characteristic absorption peak spectrum of soil, and soil samples can be diluted without KBr. The testing procedure is simple and easy to operate, which can be applied to quantitative analysis of soil samples.

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Last Update: 2022-10-20