Abstract
Alkaline extractions from humic material are used to risk assessment in soils. However, there are questions about the type of extraction most suitable for this evaluation. Thus, this work evaluated different soil extractions in search of realistic environmental conditions (simulated rain). The parameters obtained revealed significant differences between the levels and structural characteristics of organic matter, depending on the extractant used, reinforcing the importance of developing methodologies and analytical procedures that minimize structural changes and may be more representative of the molecular structures of organic matter found in soils. The results showed that the material extracted by simulated rain is similar to the fulvic acids of the soil organic matter extracted by alkaline extraction showing the importance of this type of extraction for risk assessment studies in soils.
Highlights
Soil organic matter (SOM) is a product of plants and animal decompositions under the action of microorganisms.[1]
Despite the controversy regarding the studies[38] of humic substances and their representativeness, the results show the similarity of the organic matter leached with fulvic acids and reinforce the need to study these fractions to better understand their role in the availability of nutrients and contaminants in different environmental compartments
The organic matter leached by simulated rain from two soils was compared with one extracted by both 0.1 mol L−1 NaOH and 0.1 mol L−1 NaNO3
Summary
Soil organic matter (SOM) is a product of plants and animal decompositions under the action of microorganisms.[1] It is a major source of soil organic carbon, pivotal for carbon balance, soil elements provision, environmental sustainability, and climatic conditions, with implications for biogeochemical processes in rivers, lakes and estuarine systems.[2,3]. Due to the heterogeneity of the SOM’s chemical composition, structural characterization is essential for a better comprehension of the activity and dynamics of these materials in natural environments.[4]. The extraction methodologies employed play a key role in SOM studies.[5] An optimal extraction. The IHSS keeps a webpage where it recommends the standardization of procedures for collection, extraction and purification of humic and fulvic acids from soils and natural waters.[9]
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