The importance of humin in soil characterisation: A study on Amazonian soils using different fluorescence techniques

Tadini, Amanda Maria; Nicolodelli, Gustavo; Mounier, Stéphane; Montes, Célia Regina; Milori, Débora Marcondes Bastos Pereira

doi:10.1016/j.scitotenv.2015.07.125

Cited by 37 publications

(23 citation statements)

References 31 publications

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“…Moreover, EEMs-PARAFAC was employed by Gao et al to investigate the characteristics of DOM released from Minjiang River and two humic-like substances and one protein-like component were found (Guo et al, 2011). Tadini et al reported humin extracted from Amazonian soils could be well characterized by EEMs-CP/PARAFA (Tadini et al, 2015). Additionally, PARAFAC analysis was also utilized to explore the soil pore water samples with biological degradation experiments and they relealed that climate warming could decreased riparian DOC concentration (Selvam et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Spectral characteristics of dissolved organic matter in various agricultural soils throughout China

et al. 2017

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Dissolved organic matter (DOM) plays an essential role in many environmental processes, particularly in soil ecosystems. In the present study, ultraviolet-visible (UV-Vis) spectroscopy and parallel factor analysis (PARAFAC) of three-dimensional fluorescence excitation-emission matrices (3D-EEMs) were used to characterize DOM extracted from various agricultural soils across four climate regions of China. The maximum (86.01 mg L) and minimum (17.39 mg L) dissolved organic carbon (DOC) concentrations were found in soils from Jiangsu and Yunnan, respectively. Specific UV-Vis absorption at 254 nm (SUVA) for soil DOM from the temperate continental climate (TCC) region was higher than that of soil DOM in other climate regions. Three fluorescence components including UVC humic-like substances (excitation peak at 400 nm, emission peak at 525 nm), UVA humic-like substances (250(330)/430 nm), and tyrosine-like materials (220(275)/320 nm) were identified in soil DOM using PARAFAC analysis. However, there were no significant differences in the distributions of these three components for soil DOM from different climate regions. Positive correlations were found among the humification index (HIX), fluorescence index (FI), and autochthonous index (BIX). Our results demonstrate that EEMs-PARAFAC could be a feasible approach for characterizing DOM in agricultural soils from different crop systems and can be used to further study complex DOM in agricultural environments.

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Section: Introductionmentioning

confidence: 99%

Spectral characteristics of dissolved organic matter in various agricultural soils throughout China

et al. 2017

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“…C1 (λex/λem: 370/425) was correlated with simpler structures (excitation and emission at low wavelengths, i.e., blue shift), while C2 (λex/λem: 450/475) was correlated with more complex moieties, such as humic-like acid from the soil (excitation and emission at longer wavelengths, i.e., red shift). Tadini et al 67 verified the presence of the same components with PARAFAC in the humin from Amazonian soils.…”

Section: Chemical and Spectroscopic Characterization Of Humic Substancesmentioning

confidence: 90%

Chemical and Spectroscopic Characteristics of Anthrosol (Amazonian Dark Earth) and Surrounding Soil from the Brazilian Amazon Forest: Evaluation of Mineral and Organic Matter Content by Depth

Bento

Constantino

Tadini

et al. 2020

J. Braz. Chem. Soc.

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The chemical and spectroscopic characteristics of soil organic matter (SOM) isolated from Amazonian dark earth (ADE) and surrounding soil (SR) were evaluated according to the soil depth. The results showed opposite trends for the soils. While ADE featured SOM with a greater aromatic condensation degree and greater hydrophobicity in the top layer, the SR showed more aliphatic and polar SOM. The SOM arrangement from ADE was less hydrophobic, aromatic, and more polar in depth. In contrast, the SOM from SR showed an increase in molecular weight and hydrophobicity. Besides the aromatic protection in the SOM from ADE, there was organo-mineral protection through binding to soil minerals. This suggested that the SOM from ADE was protected by its hydrophobicity and interaction with minerals compared with that from the SR, thereby showing that the combination of both characteristics is important to create new technologies for soil carbon storage.

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“…The generally accepted approach to assessing biological activity and the manifestation of, for example, a detoxifying effect by identifying the relationship with the source of origin of HS, as well as the chemical structure of commercial preparations, is not sufficiently correct. First, regardless of the source of origin, all HS have a number of common properties: the ability to hydrophilic-hydrophobic interactions and complexation, anti-radical, antioxidant and radioprotective activity, enzymatic activity, as well as membranotropic properties [49][50][51][52]. Secondly, the existing approach does not explain the inconsistency of the experimental data obtained.…”

Section: Introductionmentioning

confidence: 99%

Correlation Biological Activity and Physicochemical Properties of Humic Acids in Aqueous Solutions

Доленко

Kravchenko

Zlatskiy

2020

Pol. J. Environ. Stud.

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Objective. The biological activity of humic acids (HA), considering them as open non-equilibrium systems, in which properties are determined by the state or level of organization of the system.Methods. The dependence of physicochemical properties of HA on their concentration (optical and sorption properties, ζ-potential and electrical conductivity, average size of optical homogeneities) were analyzed by several methods: optical microscopy; low-angle laser light scattering (LALLS) method on a Zetasizer Nano ZS analyzer; absorption on a Shimadzu UV-3600 spectrophotometer; chemical analysis on an ICP-QMS Agilent 7500CE spectrometer. Biological activity of HA was studied on the crustacean Daphnia magna and the monocotyledonous plants Allium cepa L.Results. It was established that the nature of the HA effect on biological objects is non-linear and has an extremum at 1 mg•L -1 . It was shown that the mineralization of solutions affects the biological activity of HA. So in the presence of the addition of mineral salts, for D. magna the effect of HA is insensible, while for A. cepa L. it changes its direction. In the absence of mineral salts at HA concentrations < 5-10 mg•L -1 , a sharp drop in the survival of D. magna and suppression of root growth of A. cepa L. was observed, and in saline solution -stimulation of root growth. It has been established that the concentration range of 5-10 mg•L -1 was also critical for concentration changes in a number of physicochemical parameters of aqueous solutions of HA, which makes it possible to consider it a phase transition characterized by new properties.Findings. It was shown that changes in various properties of aqueous solutions of HA, including biological activity, were characterized by non-linear concentration dependencies with the presence of intermittent changes indicating qualitative rearrangements in the system.

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The importance of humin in soil characterisation: A study on Amazonian soils using different fluorescence techniques

Cited by 37 publications

References 31 publications

Spectral characteristics of dissolved organic matter in various agricultural soils throughout China

Spectral characteristics of dissolved organic matter in various agricultural soils throughout China

Chemical and Spectroscopic Characteristics of Anthrosol (Amazonian Dark Earth) and Surrounding Soil from the Brazilian Amazon Forest: Evaluation of Mineral and Organic Matter Content by Depth

Correlation Biological Activity and Physicochemical Properties of Humic Acids in Aqueous Solutions

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