Soil variability description using Fourier transform mid-infrared photoacoustic spectroscopy coupling with RGB method

Ma, Fang; Zeng, Yonghu; Du, Changwen; Shen, Yue; Ma, Hongwei; Xu, Sheng; Zhou, Jianmin

doi:10.1016/j.catena.2017.01.005

Cited by 15 publications

(3 citation statements)

References 37 publications

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“…FTIR-PAS and LIBS provide the advantages of rapid and simple operation. These unique features lead to the application of two spectroscopy techniques in a wide range of the samples such as soil samples [13], biological samples [14], polymer samples [15], and more. FTIR-PAS is based on FTIR combined with photoacoustic technology.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Polyacrylate in the Outdoor Agricultural Soil Measured by FTIR-PAS and LIBS

Liang

et al. 2018

Polymers

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Recently, polyacrylates (PA) have been applied in coated controlled-release fertilizer (CRF), but the impacts of the soil on the degradation of PA have not been evaluated. In this study, an outdoor agriculture soil buried test was carried out for 12 months to investigate the degradation of PA films. The residual degraded films were taken regularly from the soil and analyzed by SEM, Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) and laser-induced breakdown spectroscopy (LIBS). The concentration of C–H and C=O molecular groups of PA were decreased, and the element concentrations of C, O, K, Si of PA were increased under the degradation process. The surface of PA became rough and the degradation of PA occurred on the surface layer. Principal component analysis (PCA) showed that soil invaded PA. The results indicated that PA were environmentally friendly when applied to CRF. FTIR-PAS and LIBS were advanced in the in-situ surface analysis of the degradation process of the polymer.

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Section: Introductionmentioning

confidence: 99%

Degradation of Polyacrylate in the Outdoor Agricultural Soil Measured by FTIR-PAS and LIBS

Liang

et al. 2018

Polymers

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“…FTIR–photoacoustic spectroscopy (FTIR–PAS), which appeared in a soil analysis two decades ago, now matured into a full-fledged characterization method − due to several advantages over other methods of IR spectroscopy of soils: a large number of well-defined bands and a broader range of the informational spectrum. − FTIR–PAS is an alternative to transmission, diffuse-reflectance, and attenuated–total reflection IR (ATR–FTIR) techniques and is less dependent on the particle size . Recently, scatter PAS techniques in the frequency regime have been proposed to study the morphology of aggregated samples and retrieve individual contributions of scattering and absorption of complex samples. , FTIR–PAS applications for soils are diverse: they involve matrix soil composition, the total SOM, the texture and mineralogy of clay minerals, the availability of nutrients, and the evaluation of other properties (fertility, structurization, and bacteriological activity). ,− Soil classification is carried out using principal component analysis, and the proportion of correctly identified samples in the control sample is usually more than 95%. , ATR–FTIR is also used for the organic matter content − and adsorbed water and minerals, including nitrates. , Its advantages from the viewpoint of sample preparation and methodology are as follows: soil samples are pre-dried, the fraction of above 2 mm is usually sieved out, and the sample is placed on the crystal with a clamping screw.…”

Section: Introductionmentioning

confidence: 99%

FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving

et al. 2022

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Granulometric fractionation as a source of additional information on organic-matter and inorganic matrix components of soils using FTIR–photoacoustic spectroscopy (FTIR–PAS) supported by attenuated–total reflection FTIR spectroscopy (ATR–FTIR) for a wide range of aggregate fractions (10–5000 μm) was used to compare the sensitivity, reproducibility, information contents, and representativity of fractionated samples. For chernozem and sod-podzolic soils and different agricultural-use chernozem samples, differences in the composition were found, manifested in normalized spectra of microaggregate fractions, with the range of 10–100 μm bearing the complete information. Most changes are observed in the soil organic matter range (1900–1340 cm–1), although these changes are slight, and in the soil-matrix region (550–300 cm–1). The latter region increases the intensity of bands corresponding to amorphous silica and clay minerals in fine fractions, while the intensity of bands attributed to quartz lattice vibrations decreases. FTIR–PAS spectra do not differ considerably at high interferometer modulation frequencies as the signal-penetration depth is comparable with particle sizes. The soil fractions below 20 μm result in the maximum sensitivity, reproducibility, and signal-to-noise ratio, showing no changes from coarser fractions by the information content and, thus, providing representative samples for analysis. The fractionation shows more differences in the sod-podzolic and chernozem soil fractions than the whole soil spectra. FTIR–PAS provides better sensitivity and reproducibility in the 4000–2000 cm–1 region and ATR–FTIR in the 2000–100 cm–1 region.

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“…This method is a developed instrument for complex samples [53,[66][67][68][69][70][71][72][73]. It is used for mineral, polymer, and technological samples, modeling the dependence of soil properties on its physical and elemental composition, moisture, porosity, and density [31,37,61,[73][74][75][76][77][78]. FTIR-PAS provides many well-defined bands and a broader region of the informational spectrum [31,79].…”

Section: Introductionmentioning

confidence: 99%

Organic Matter and Mineral Composition of Silicate Soils: FTIR Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection Modalities

2021

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This study aims to compare photoacoustic (FTIR–PAS), diffuse reflectance (DRIFT), and attenuated total reflection (ATR) FTIR modalities in the wide wavenumber range from NIR (7500 cm−1) to FIR (150 cm−1) for the same silicate soil samples under the same conditions. The possibilities of non-destructive rapid qualitative analysis of soils by these modalities without comprehensive data treatment were compared. The assignment of more than 100 bands for the chernozem and sod-podzolic as common types of silicate types of soil was made. The following groups of bands of organic matter and inorganic matrix were reliably found in spectra of all or at least two modalities: 3690–3680 cm−1 (hydrogen-bonded SiO–H…H2O stretch, not ATR), 2930–2910 cm−1 and 2860–2850 cm−1 (methylene stretch), 1390–1380 cm−1, (symmetric stretch carboxylate, DRIFT and FTIR–PAS); 2000–1990 cm−1, 1885 cm−1, and 1790–1783 cm−1 (SiO2 overtones, DRIFT and FTIR–PAS), 1163–1153 cm−1, SiO2 lattice (not FTIR–PAS), 1037 cm−1 (Si–O or Al–O stretch), 796 cm−1 (lattice symmetrical Si–O–Si stretch); 697 cm−1, SiO2; and 256 cm−1 (not FTIR–PAS). Amide I, II, and III bands appear in DRIFT and FTIR–PAS spectra while not in ATR. Except for methylene and carboxylate groups, CH vibrations (3100–2900 cm−1) are not seen in ATR. Bands at 1640–1630 cm−1, 1620–1610 cm−1, 1600–1598 cm−1 (primary water bands and probably carboxylate) appear in the spectra of all three modalities but are unresolved and require data treatment. It is preferable to use all three modalities to characterize both soil organic matter and mineral composition. DRIFT provides the maximum number of bands in all three modalities and should be selected as a primary technique in the NIR and 4000–2000 cm−1 regions for hydrogen-bonding bands, CHX groups, and the silicate matrix. ATR–FTIR complements DRIFT and provides a good sensitivity for soil water and the matrix in 2000–400 cm−1. FTIR–PAS in 4000–1500 cm−1 reveals more bands than DRIFT and shows the highest sensitivity for absorption bands that do not appear in DRIFT or ATR-IR spectra. Thus, FTIR–PAS is expedient for supporting either DRIFT or ATR–FTIR. This modality comparison can be a basis for methodological support of IR spectroscopy of soils and similar organomineral complexes.

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Soil variability description using Fourier transform mid-infrared photoacoustic spectroscopy coupling with RGB method

Cited by 15 publications

References 37 publications

Degradation of Polyacrylate in the Outdoor Agricultural Soil Measured by FTIR-PAS and LIBS

Degradation of Polyacrylate in the Outdoor Agricultural Soil Measured by FTIR-PAS and LIBS

FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving

Organic Matter and Mineral Composition of Silicate Soils: FTIR Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection Modalities

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