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Optimized isolation method of humin fraction from mineral soil material
Jerzy Weber1, Elżbieta Jamroz2, Andrzej Kocowicz2
1Institute of Soil Science and Environmental Protection, Wroclaw University of Environmental and Life Sciences, ul. Grunwaldzka 53, 50-357, Wrocław, Poland. jerzyweber@gmail.com.
Environmental Geochemistry and Health
|July 17, 2021
Summary
This study presents a new method for isolating humin, a crucial soil component, by removing soluble and mineral parts. This effective procedure yields high amounts of humin with low ash content for environmental studies.
Area of Science:
- Environmental Science
- Soil Science
- Organic Geochemistry
Background:
- Humic substances, particularly the humin fraction, are vital in managing environmental contaminants.
- Humin remains the least studied humic fraction due to isolation challenges.
Purpose of the Study:
- To detail a novel and effective method for isolating the humin fraction from soil.
- To address the methodological difficulties in humin isolation.
Main Methods:
- A modified International Humic Substances Society method for humic acid (HA) and fulvic acid (FA) extraction using 0.1 M NaOH.
- Repeated digestion of mineral components with 10% HF/HCl until near-complete removal.
Main Results:
- The proposed method isolates humin by removing soluble organic and mineral components, rather than direct extraction.
- Achieved high efficiency and recovery of humin with minimal ash content.
- The chemical structure of humin was preserved during the isolation process.
Conclusions:
- The described procedure offers a reliable and efficient way to isolate substantial quantities of humin from soil.
- This method facilitates further research into the role of humin in environmental processes.
