期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 86, 期 -, 页码 227-232出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2012.09.024
关键词
Landfill leachate; Dissolved organic matter (DOM); Fluorescence excitation-emission matrix (EEM) spectra; Mercury
资金
- National Natural Science Foundation of China [51078340]
- National Public Benefit (Environmental) Research Foundation of China [200909079, 201109009]
Dissolved organic matter obtained from landfill leachate was separated into hydrophobic acid, base, neutral (HOA, HOB, HON) and hydrophilic (HIM) fractions. Fluorescence excitation-emission matrix spectra and parallel factor analysis were employed to characterize the composition, and fluorescence quenching titration technique was applied to study the complexation between Hg (II) and HON, HOA, and HIM fractions. Protein-like substances, humic-like compounds and xenobiotic organic matters (XOM) were identified in all fractions. The HOA, HOB and HON fractions comprised mainly XOM, while the HIM fraction consisted primarily of humic-like compounds. The complexation ability of protein-like substances was higher than that of humic-like compounds. The complexation ability of the HIM was highest for protein-like substances, while the complexation ability of the HON fraction was the highest for humic-like substances. The results suggested that the toxicity and bioavailability of the mercury in the young leachates was the highest, and decreased with landfill time. (C) 2012 Elsevier Inc. All rights reserved.
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