EGU21-8456
https://doi.org/10.5194/egusphere-egu21-8456
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Selected properties of the humin fraction isolated from Chernozems and Phaeozems from various regions of Poland 

Elżbieta Jamroz1, Jerzy Weber1, Maria Jerzykiewicz2, Andrzej Kocowicz1, Magdalena Dębicka1, Jakub Bekier1, Irmina Ćwieląg-Piasecka1, Aleksandra Ukalska-Jaruga3, Lilla Mielnik4, and Romualda Bejger4
Elżbieta Jamroz et al.
  • 1Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland (elzbieta.jamroz@upwr.edu.pl)
  • 2University of Wroclaw, Faculty of Chemistry, Wroclaw, Poland
  • 3Institute of Soil Science and Plant Cultivation – State Research Institute, Puławy, Poland
  • 4West Pomeranian University of Technology in Szczecin, Department of Bioengineering, Physics and Agrophysics Lab, Szczecin, Poland

Humin fraction of soil organic matter is assigned to play an important role in carbon sequestration and sorption of xenobiotics. This study concerns the properties of humin (elemental composition, FTIR and SEM-EDS of humin ash) isolated from mollic horizons of eight Chernozems and Phaeozems, used as arable soils in various regions of Poland. Isolation procedure was described by Weber et al. (2021) in another abstract presented in this session. Investigated soils differed in the content of TOC, ranging from 13.3 to 41.7 g kg−1, as well as texture from loam (Magnice, Pyrzyce) through silt loam (Trzebnik, Ciepłowody, Hrubieszów) and sandy clay loam (Psary) till clay (Ziemnice, Kętrzyn). They also differed in their pH values (from 5.64 to 7.71), and CEC (from 21.6 to  53.2cmol(+)kg-1). Ash content of humin varied between 22.89%  - 54.50%, which is typical for humin originated from mineral soils (Stevenson 1994). This parameter was not correlated neither with the content of <0.002 mm fraction nor TOC content. SEM-EDS analyzes revealed that ash contained mainly Mg (3 – 14 weight%), Al (4 – 22 weight %) and Ti (10 – 25 weight%), depending on the area studied. The lowest pH as well as  the highest TOC and CEC showed Trzebnik soil. Humin from this soil indicated the lowest content of carbon (30.84 %) and the highest values of H/C ratio, which point out to the higher aliphacity of their molecules (Rice and MacCarthy 1991). High O/C ratio (0.91) calculated for humin from Trzebnik is common for more oxidized carbohydrate molecules and makes them similar to fulvic acids which are polysaccharidic in nature (Tan 2014). In contrast, the lowest TOC and CEC were determined in Ciepłowody soil. Humin molecules from this soil indicated the highest carbon content (43.12 %) and the lowest H/C ratio, what reflects the highest aromacity among investigated samples. FTIR spectra confirmed results from elemental analysis and indicated that humin from Ciepłowody and Hrubieszów was the most aromatic among all analyzed soils.

 

References:

Hayes M.H.B., Mylotte R., Swift R.S. 2017. Humin: Its Composition and Importance in Soil Organic Matter. In: Sparks D.L. (ed) Advances in Agronomy, Vol. 143, Academic Press, Burlington, 47–138.

Rice J.A., MacCarthy P. 1991. Statistical evaluation of the elemental composition of humic substances. Org. Geochem, 17(5), 635-648.

Stevenson FJ. 1994. Humus chemistry: Genesis, composition, and reactions. New York: John Wiley and Sons, p 512.

Swift R.S. 1996. Organic matter characterization. In: Methods of soil analysis. Part 3. Chemical methods – SSSA Book Series no.5. Soil Science Society of America and American Society of Agronomy, pp 1011-1068.

Tan HK. 2014. Humic matter in soil and the environment, 2nd edn. CRC Press, Boca Raton, p 463.

Weber J., Jamroz E., Kocowicz A., Debicka M., Ukalska-Jaruga A., Mielnik L., Bejger R., Jerzykiewicz M., Bekier J., Ćwieląg-Piasecka I. Recommendations for isolation of humin fraction from soil material. EGU21-8315

 

Acknowledgements

This work was supported by the National Science Center (NCN) Poland (project No 2018/31/B/ST10/00677 “Chemical and spectroscopic properties of soil humin fraction in relation to their mutual interaction with pesticides")

How to cite: Jamroz, E., Weber, J., Jerzykiewicz, M., Kocowicz, A., Dębicka, M., Bekier, J., Ćwieląg-Piasecka, I., Ukalska-Jaruga, A., Mielnik, L., and Bejger, R.: Selected properties of the humin fraction isolated from Chernozems and Phaeozems from various regions of Poland , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8456, https://doi.org/10.5194/egusphere-egu21-8456, 2021.