Spectroscopic studies of the progress of humification processes in humic substances extracted from refuse in a landfill

Xiaoli Chai, Takayuki Shimaoka, Xiaoyan Cao, Qiang Guo, Youcai Zhao

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Humic acids (HA) and fulvic acids (FA) extracted from refuse in a landfill at different landfill ages were characterized by elemental composition, GPC, FTIR, and 13C CP/MAS NMR. The elemental composition analysis revealed high O/C and low H/C ratios in the FA, indicating a high proportion of O-alkyl and carboxylic acids in the FA. The Mw and Mn values and Mw/Mn ratios indicated that the HA had a higher molecular weight and were more homogeneous with respect to molecular weight. FTIR spectra showed that the FA had relatively more intense bands assigned to aliphatic structures and were abundant in oxygen-containing function groups. The analytical results of 13C CP/MAS NMR suggested that there were more oxygenated aliphatic carbons and fewer aromatic carbons in the FA than in the HA. All the results demonstrated that the degree of humification increased with landfill age.

Original languageEnglish
Pages (from-to)1446-1453
Number of pages8
JournalChemosphere
Volume69
Issue number9
DOIs
Publication statusPublished - Nov 1 2007

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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