Characterization of humic and fulvic acids extracted from landfill by elemental composition, 13C CP/MAS NMR and TMAH-Py-GC/MS

Chai Xiaoli, Takayuki Shimaoka, Guo Qiang, Zhao Youcai

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Humic acid (HA) and fulvic acid (FA) extracted from landfills at different landfill ages were characterized by elemental composition, 13C CP/MAS NMR, and TMAH-Py-GC/MS. 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 analytical results of 13C CP/MAS NMR suggested that there were more oxygenated aliphatic carbons and fewer aromatic carbons in FA than in HA. The Py-GC/MS products showed that the HA and FA extracted from the refuse in the landfill were mainly composed of various lignin-derived compounds. Oxidized aromatic acid derivatives originated from the oxidation of side-chains of lignin-like compounds, and this process played a significant role in the process of HA and FA formation in the landfill. All of the results demonstrated that the degree of humification increased with landfill age.

Original languageEnglish
Pages (from-to)896-903
Number of pages8
JournalWaste Management
Volume28
Issue number5
DOIs
Publication statusPublished - Feb 29 2008

All Science Journal Classification (ASJC) codes

  • Waste Management and Disposal

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