Characterization of humic acids in sediments from dam reservoirs by pyrolysis-gas chromatography/mass spectrometry using tetramethylammonium hydroxide: Influence of the structural features of humic acids on iron(II) binding capacity

Masami Fukushima, Ken Furubayashi, Naotaka Fujisawa, Mio Takeuchi, Takeshi Komai, Keishi Otsuka, Mitsuo Yamamoto, Yasunari Kawabe, Shigekazu Horiya

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The structural features of humic acids (HAs) isolated from sediments on the bottom of dam reservoirs that can affect their binding capacities for Fe(II) were investigated by pyrolysis-gas chromatography/mass spectroscopy using tetramethylammonium hydroxide (TMAH-py-GC/MS). The binding capacities for Fe(II) increased with increasing O/C molar ratio, suggesting that the oxygen-containing functional group content plays a role in the binding of Fe(II). However, it was not possible to identify specific binding-sites for Fe(II) by TMAH-py-GC/MS analysis. Although C16:1ω7, iso-C 15:0 and anteiso-C17:0 fatty acids, which serve as molecular markers of anaerobic microbial activity, were detected in all of the HA samples, the contents of these acids were not correlated with binding capacities for Fe(II). However, the ratio of C16:0 to C 16:1ω7 fatty acids, which is used as an index of anaerobic bacterial activity, increased with increasing Fe(II) binding capacities of the HAs. It thus appears likely that the activities of anaerobic bacteria on the bottom of dam reservoirs contribute to alterations in the structural features for HAs, and that this process results in increased binding capacities for Fe(II).

Original languageEnglish
Pages (from-to)323-331
Number of pages9
JournalJournal of Analytical and Applied Pyrolysis
Volume91
Issue number2
DOIs
Publication statusPublished - 2011 Jul
Externally publishedYes

Keywords

  • Fatty acids
  • Fe(II) binding capacity
  • Humic acid
  • Sediment
  • TMAH-pyrolysis-GC/MS

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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