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

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<p>Humin fraction of soil organic matter is assigned to play an important role in carbon sequestration and sorption of xenobiotics. This study concerns luminescence properties (fluorescence and delayed luminescence) of humin fraction 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. (2022). Investigated soils differed in the content of TOC, ranging from 13.3 to 41.7 g kg^&#8722;1, as well as texture from loam (Magnice, Pyrzyce) through silt loam (Trzebnik, Ciep&#322;owody, Hrubiesz&#243;w) and sandy clay loam (Psary) till clay (Ziemnice, K&#281;trzyn). They also differed in their pH values (from 5.64 to 7.71), and CEC (from 21.6 to&#160; 53.2 cmol(+)kg^-1). Ash content of humin varied between 22.89%&#160; - 54.50%, which is typical for humin originated from mineral soils (Stevenson 1994).</p><p>References:</p><p>Stevenson FJ. 1994. Humus chemistry: Genesis, composition, and reactions. New York: John Wiley and Sons, p 512.</p><p>Weber J., Jamroz E., Kocowicz A., D&#281;bicka M., Bekier J., &#262;wiel&#261;g-Piasecka I., Ukalska-Jaruga A., Mielnik L., Bejger R., Jerzykiewicz M. (2022). Optimized isolation method of humin fraction&#160; from mineral soil material. Environmental Geochemistry and Health, 1-10 https://doi.org/10.1007/s10653-021-01037-3&#160;</p><p>&#160;</p><p>Acknowledgements</p><p>This work was supported by the National Science Center (NCN) Poland (project No 2018/31/B/ST10/00677 &#8220;Chemical and spectroscopic properties of soil humin fraction in relation to their mutual interaction with pesticides")</p><p>&#160;</p>