Zhang Yulong, Huang Wen, Ran Yong, Mao Jingdong
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Mar Pollut Bull. 2014 Aug 15;85(1):60-6. doi: 10.1016/j.marpolbul.2014.06.022. Epub 2014 Jul 8.
Dissolved organic matter (DOM) from riverine and lacustrine water was isolated using a reverse osmosis (RO) system. Solid-state (13)C nuclear magnetic resonance ((13)C 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 (13)C NMR and δ(13)C 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.
利用反渗透（RO）系统分离了河流和湖泊水中的溶解有机物（DOM）。采用固态¹³C核磁共振（¹³C NMR）定量评估DOM的组成和成分，并与之前对海洋DOM的研究进行比较。结果表明，浓缩因子（CF）是控制DOM在RO系统上的产率和吸附的关键指标。基于¹³C NMR和δ¹³C分析，吸附可能是非选择性的。碳水化合物和脂质分别占可识别DOM的25.0 - 41.5%和30.2 - 46.3%，其次是蛋白质（18.2 - 19.8%）和木质素（7.17 - 12.8%）。与海洋DOM相比，淡水DOM含有更高的烷基和芳香碳，但烷氧基和羧基碳含量较低。使用高分子量（HMW）DOM的结构并不能完全解释这种结构差异，这表明在DOM从河流向海洋的运输过程中，其转化涉及尺寸变化。
