title: Fluorescence excitation-emission matrix spectroscopy with regional integration analysis for characterizing composition and transformation of dissolved organic matter in landfill leachates.
abstract: Dissolved organic matter (DOM) obtained from landfill leachates was separated into hydrophobic base, hydrophilic matter (HIM), hydrophobic acid (HOA), and hydrophobic neutral fractions. The composition and transformation of the DOM and its fractions were investigated. The results show that the DOM isolated from young, intermediate, and old landfill leachates were mainly composed of tyrosine-, tryptophan-, and humic- and fulvic-like substances, respectively. The primary fractions of the DOM in leachates were HOA and HIM. The HOA and HIM fractions from young leachates predominantly contained tryptophan- and tyrosine-like materials, respectively. The HOA fractions in intermediate and old leachates were mainly composed of humic- and fulvic-like materials, whereas the HIM fractions were dominated by tryptophan-like materials and humic- and fulvic-like substances. The hydrophobic organic fractions and humic- and fulvic-like substances increased with time, whereas the HIM and the tyrosine-like materials decreased during the landfill process, rendering biological processing of leachates ineffective.
authors.affiliation: Laboratory of Water Environmental System Engineering, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Xiao-Song
authors.initials: XS
authors.lastname: He
authors.forename: Bei-Dou
authors.initials: BD
authors.lastname: Xi
authors.forename: Zi-Min
authors.initials: ZM
authors.lastname: Wei
authors.forename: Yong-Hai
authors.initials: YH
authors.lastname: Jiang
authors.forename: Yu
authors.initials: Y
authors.lastname: Yang
authors.forename: Da
authors.initials: D
authors.lastname: An
authors.forename: Jin-Ling
authors.initials: JL
authors.lastname: Cao
authors.forename: Hong-Liang
authors.initials: HL
authors.lastname: Liu
mesh_terms: D001578:Benzopyrans / Q000032:analysis; D006812:Humic Substances / Q000032:analysis*; D057927:Hydrophobic and Hydrophilic Interactions; D009930:Organic Chemicals / Q000032:analysis; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014364:Tryptophan / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D014364:Tryptophan; C005023:fulvic acid