NDLI: Spectroscopic characterization and molecular weight distribution of dissolved organic matter in sediment porewaters from Lake Erhai, Southwest China

Content Provider	Springer Nature Link
Author	Fu, Pingqing Wu, Fengchang Liu, Cong Qiang Wei, Zhongqing Bai, Yingchen Liao, Haiqing
Copyright Year	2006
Abstract	Dissolved organic matter (DOM) in sediment porewaters from Lake Erhai, Southwest China was investigated using dissolved organic carbon (DOC) concentration, UV absorbance, fluorescence and molecular weight distribution. DOC exhibited a high concentration at the sediment–water interface with a rapid decrease to the oxic–anoxic interface at approximately 7 cm, and then increased with depth. Similar trends were also found for the UV absorption coefficients at 254 and 280 nm in the porewaters. DNA in the sediment was also measured, which confirmed the high abundance of aerobic bacteria in the upper layer of the sediment. Both humic-like (peaks A and C) and protein-like (peaks B and D) fluorescence were observed in the porewater DOM, and their fluorescence intensities exhibited a similar porewater profile as DOC concentration. A strong correlation was found between the peak fluorescence intensity ratio r(A, C) and r(D, B). Both the fluorescence index and UV absorption coefficient at 254 nm suggested a dramatic increase in aromaticity of porewater DOM across the oxic–anoxic interface. Porewater DOM exhibited a multimodal distribution of molecular weight with a relatively low polydispersity. The results of this study offer significant insight into the nature and properties of DOM in freshwater ecosystems.
Starting Page	179
Ending Page	189
Page Count	11
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	81
Issue Number	2
e-ISSN	1573515X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-07-28
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Dissolved organic matter Sediment Porewater DNA Fluorescence Molecular weight Terrestrial Pollution Soil Science & Conservation Biochemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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