The role of humic substances in chromium sorption onto natural organic matter (peat)

J. Kyziol, I. Twardowska, Ph Schmitt-Kopplin

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


To elucidate mechanisms of Cr3+ sorption onto the unaltered solid natural organic matter, the comparative studies of this ion binding from a solution at pH 4.0 onto three selected particle size fractions: 2000-1000 μm, 630-200 μm and 63-20 μm of markedly different HS content and structure, separated by a wet sieving from an overall sample of peat (Brushwood Peat Humus) were carried out. Comparable patterns of COOH groups and CECt confirmed that for cation exchange capacity were responsible mainly cations connected with COO- functional groups. It was though found that aliphatic acids in the solid state did not take part in Cr3+ binding, thus the finest studied fraction 63-20 μm of the highest contents of functional groups showed the lowest sorption capacity for Cr3+, while similar patterns of sorbed Cr3+, soluble HS content and base CEC0 indicated that these parameters were directly interrelated. The base ion exchange processes determined by CEC0 (with Ca2+ as a predominant exchangeable cation) appeared to be not the major mechanisms responsible for Cr3+ sorption. For this metal, strong binding to insoluble large molecular weight organic pool two- to threefold prevailed over the ion exchange processes. Very low acid desorption indicated generally low mobility of Cr3+-organic compounds.

Original languageEnglish
Pages (from-to)1974-1982
Number of pages9
Issue number11
StatePublished - Jun 2006
Externally publishedYes


  • Chromium
  • Humic substances
  • Mobilization
  • Natural organic matter
  • Particle size fractions
  • Peat
  • Sorption


Dive into the research topics of 'The role of humic substances in chromium sorption onto natural organic matter (peat)'. Together they form a unique fingerprint.

Cite this