期刊
ORGANIC GEOCHEMISTRY
卷 82, 期 -, 页码 69-76出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2015.02.007
关键词
Hydroxyl radical; Lignin; FTICR-MS; Humification; Black carbon
资金
- Old Dominion University Frank Batten Endowment
Exposure of lignin-derived organic matter (OM) to hydroxyl radicals originating from Fenton type reactions generates condensed aromatic and alicyclic aliphatic compounds, as shown using ultrahigh resolution mass spectrometry. Although condensed aromatic compounds are common in soil and dissolved OM, their presence has been attributed largely to combustion. A non-pyrogenic route for the formation of condensed aromatic compounds from lignin is suggested here, specifically that hydroxyl radical-initiated oxidation of lignin is capable of producing black carbon-like condensed aromatic compounds. Alicyclic aliphatic compounds are also produced, likely as part of a concerted process involving ring opening, polymerization and/or cyclization and hydrogen abstraction. Hydroxyl radicals associated with lignin degradation are produced through photochemistry in aqueous systems and enzymatic microbial processes in soil. (C) 2015 Elsevier Ltd. All rights reserved.
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