EPR Analysis of Fe3+ and Mn2+ Complexation Sites in Fulvic Acid Extracted from Lignite

Z. Klencsár, Zoltán Köntös

Research output: Article

5 Citations (Scopus)


Lignite is a rich source of humic substances such as humic and fulvic acids that are natural chelating agents with multifold applications in fields ranging from agriculture to biomedicine. Associations of heterogeneous molecular components constitute to their complex and still unresolved structure. In this work we utilize X-band electron paramagnetic resonance (EPR) spectroscopy to characterize Fe3+ and Mn2+ complexation sites in fulvic acid (FA) extracted from lignite. EPR signals of FA-Fe3+ and FA-Mn2+ complexes are identified and investigated in detail under various conditions by the means of a newly developed program code and associated analysis method that yields an accurate description of the low-field (geff ≈ 10-3) range EPR signal by assuming discrete distributions in the axial (D) and rhombic (λ) zero field splitting (ZFS) parameters associated with Fe3+ complexation sites. The results refer to the presence of FA-Fe3+ complex structures with either low (|D| ≈ 0.26 cm-1) or high (|D| ≥ 1.0 cm-1) axial ZFS parameters along with a broad distribution in λ. Outer-sphere, [Fe(OH2)6]3+ based complexes are found to be characterized with λ = 1/3 along with lower axial ZFS values, in accordance with a distorted octahedral ligand configuration.

Original languageEnglish
Pages (from-to)3190-3203
Number of pages14
JournalJournal of Physical Chemistry A
Issue number12
Publication statusPublished - márc. 29 2018

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'EPR Analysis of Fe<sup>3+</sup> and Mn<sup>2+</sup> Complexation Sites in Fulvic Acid Extracted from Lignite'. Together they form a unique fingerprint.

  • Cite this