title: Characterizing the compositional variation of dissolved organic matter over hydrophobicity and polarity using fluorescence spectra combined with principal component analysis and two-dimensional correlation technique.
abstract: Dissolved organic matter (DOM) obtained from three leachates with different landfill ages was fractionated, and its compositional variation based on hydrophobicity and polarity was characterized by synchronous fluorescence spectra combined with principal component analysis (PCA) and two-dimensional correlation technique. The results showed that the bulk DOM and its fractions were comprised of tryosine-, tryptophan-, fulvic-, and humic-like substances. Tyrosine-like matter was dominant in the young leachate DOM and its fractions, while tryptophan-, fulvic-, and humic-like substances were the main components in the intermediate and old leachate DOMs and their fractions. Tryosine-, tryptophan-, fulvic-, and humic-like substances varied concurrently with the hydrophobicity and polarity. However, the change ratio of these substances was different for the three leachates. Tyrosine-like matter, humic-like materials, and fulvic-like substances were the most sensitive to the hydrophobicity and polarity in the young, intermediate, and old leachates, respectively. Such an integrated approach jointly enhances the characterization of the hydrophobicity- and polarity-dependent DOM fractions and provides a promising way to elucidate the environmental behaviors of different DOM species.
authors: High-Tech Research Institute, Beijing University of Chemical Technology, Beijing, 100029, China.
authors: Ben-Sheng
authors: BS
authors: Su
authors: College of Science, Minzu University of China, Beijing, 100081, China.
authors: Zhen
authors: Z
authors: Qu
authors: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, 100012, Beijing, China. hexs82@126.com.|Innovation Base of Ground Water & Environmental System Engineering, Chinese Research Academy of Environmental Science, 100012, Beijing, China. hexs82@126.com.
authors: Xiao-Song
authors: XS
authors: He
authors: High-Tech Research Institute, Beijing University of Chemical Technology, Beijing, 100029, China.
authors: Ying-Hao
authors: YH
authors: Song
authors: High-Tech Research Institute, Beijing University of Chemical Technology, Beijing, 100029, China.
authors: Li-Min
authors: LM
authors: Jia
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005453:Fluorescence; D006812:Humic Substances / Q000032:analysis; D057927:Hydrophobic and Hydrophilic Interactions; D009930:Organic Chemicals; D025341:Principal Component Analysis; D013050:Spectrometry, Fluorescence / Q000379:methods; D014364:Tryptophan; D014443:Tyrosine
chemical_list: D006812:Humic Substances; D009930:Organic Chemicals; D014443:Tyrosine; D014364:Tryptophan
keywords: Dissolved organic matter; Landfill leachates; Principal component analysis; Synchronous fluorescence spectra; Two-dimensional correlation technique