DOI: 10.1016/j.watres.2018.02.016
Scopus记录号: 2-s2.0-85042285393
论文题名: Intriguing changes in molecular size and composition of dissolved organic matter induced by microbial degradation and self-assembly
作者: Xu H. ; Guo L.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 187
结束页码: 194
语种: 英语
英文关键词: Colloids
; Dissolved organic matter
; Microbial degradation
; Self-assembly
; Size continuum
Scopus关键词: Biodegradation
; Biogeochemistry
; Biological materials
; Carbohydrates
; Colloids
; Dissolution
; Fractionation
; Liquid chromatography
; Organic carbon
; Proteins
; Trace elements
; Water pollution
; Water quality
; Water treatment
; Biogeochemical cycling
; Dissolved organic matters
; Dynamic transformation
; Flow field flow fractionations
; High molecular weight
; Microbial degradation
; Size continuum
; Transformation pathways
; Self assembly
; carbohydrate
; dissolved organic matter
; fulvic acid
; humic acid
; organic carbon
; protein
; fresh water
; organic compound
; trace element
; Article
; biogeochemical cycling
; colloid
; environmental impact
; humic substance
; microbial degradation
; molecular size
; molecular weight
; nonhuman
; physical chemistry
; priority journal
; total organic carbon
; analysis
; bacterium
; bioremediation
; chemistry
; estuary
; field flow fractionation
; metabolism
; microbiology
; water quality
; Bacteria
; Biodegradation, Environmental
; Estuaries
; Fractionation, Field Flow
; Fresh Water
; Humic Substances
; Organic Chemicals
; Trace Elements
; Water Quality
英文摘要: Dissolved organic matter (DOM) is ubiquitous and plays an important role in regulating water quality, ecological function, and the fate and transport of trace elements and pollutants in aquatic environments. Both the colloidal precursors (i.e. <1 kDa) and bulk DOM collected from a freshwater estuary were incubated in the dark for 21 days to examine dynamic changes in molecular size and composition induced by microbial degradation and self-assembly. Results showed that the concentrations of total organic carbon, carbohydrates, and protein-like substances decreased by 11–30% during incubation, while those of humic- and fulvic-like substances remained relatively constant, indicating humic substances are more resistant to microbial utilization compared to carbohydrates and protein-like DOM. Despite the different extents in decline, these DOM components had a similar transformation pathway from the <1 kDa to colloids (1 kDa–0.45 μm) and further to microparticles (>0.45 μm). Overall, carbohydrates and protein-like substances, especially the high molecular weight components, were preferentially decomposed by microorganisms whereas humic- and fulvic-like DOM components significantly coagulated through abiotic self-assembly. The contrasting degradation/transformation pathways between the humic-like and protein-like substances along the size continuum, as also characterized by flow field-flow fractionation analysis, demonstrated that the dynamic transformation and degradation of DOM is regulated by both molecular size and organic composition. This finding provides new insights into the biogeochemical cycling pathways of heterogeneous DOM and its environmental fate and ecological role in aquatic systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112894
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; School of Freshwater Sciences, University of Wisconsin-Milwaukee, 600 E Greenfield Ave., Milwaukee, WI 53204, United States
Recommended Citation:
Xu H.,Guo L.. Intriguing changes in molecular size and composition of dissolved organic matter induced by microbial degradation and self-assembly[J]. Water Research,2018-01-01,135