Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

MARINE POLLUTION BULLETIN

卷:85

Article

Zhang, Yulong¹  Huang, Wen^1,2  Ran, Yong¹  Mao, Jingdong³ 

[1] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA

关键词: Dissolved organic matter;    Isolation;    Composition;    Reverse osmosis;    C-13 NMR;    Stable carbon isotope;   

DOI  :  10.1016/j.marpolbul.2014.06.022

来源: Elsevier

【 摘 要 】

Dissolved organic matter (DOM) from riverine and lacustrine water was isolated using a reverse osmosis (RO) system. Solid-state C-13 nuclear magnetic resonance (C-13 NMR) was used to quantitatively evaluate the compositions and constituents of DOM, which are compared with previous investigations on marine DOM. Results indicated that concentration factor (CF) was a key metric controlling yield and sorption of DOM on the RO system. The sorption was likely non-selective, based on the C-13 NMR and delta C-13 analyses. Carbohydrates and lipids accounted for 25.0-41.5% and 30.2-46.3% of the identifiable DOM, followed by proteins (18.2-19.8%) and lignin (7.17-12.8%). The freshwater DOM contained much higher alkyl and aromatic C but lower alkoxyl and carboxyl C than marine DOM. The structural difference was not completely accounted for by using structure of high molecular weight (HMW) DOM, suggesting a size change involved in transformations of DOM during the transport from rivers to oceans. (C) 2014 Elsevier Ltd. All rights reserved.

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