Composition and copper binding properties of aquatic fulvic acids in eutrophic Taihu Lake, China
Composition and copper binding properties of aquatic fulvic acids in eutrophic Taihu Lake, China
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富营养化太湖水生黄腐酸的组成及铜结合特性
DOI：
10.1016/j.chemosphere.2017.01.008
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发表时间：
2017-04-01
期刊：
影响因子：
8.8
通讯作者：
Du, Jinzhou
中科院分区：
文献类型：
--
作者：
Li, Weiwei;Zhang, Fenfen;Du, Jinzhou
富里酸（FA）在水生生态系统的生源元素循环中起着重要的作用，而水生生态系统的有机组成对FA的影响很大。采用二维相关光谱、傅里叶变换红外光谱（2D-COS-FTIR）、核磁共振（NMR）和元素分析等方法，研究了太湖水华和非水华期间水体中FA的含量及其结合特性。与非水华FA相比，水华FA具有较低的氮含量和较高的C/N比。它含有更多的羧基和脂肪族基团，而较少的酰胺基团。2D-COS-FTIR光谱证明Bloom FA中的羧基对Cu（II）结合的响应最快。水华FA中的多糖对Cu（II）浓度的响应性比非水华FA中的强。与水华富氮有机物相比，非水华富氮有机物与Cu（II）的结合顺序更快。对FA与Cu（II）相互作用过程的综合分析表明，FA中的含氮基团和含氧基团对Cu（II）的结合都很活跃。藻类产品和微生物群落多样性可能是导致富营养化水体中有机基团与Cu（II）结合行为发生变化的主要原因。研究结果对富营养化湖泊中溶解有机物的动态生态地球化学过程和痕量金属循环过程的研究具有重要意义。(C)2017爱思唯尔有限公司版权所有
Fulvic acid (FA) plays a significant role in biogenic-elemental cycling in aquatic ecosystems which is highly dependent on their organic composition. In this study, the aquatic FA contents and binding properties during bloom and non-bloom periods in Taihu Lake were investigated by two-dimensional correlation spectroscopy Fourier transform infrared spectroscopy (2D-COS-FTIR), nuclear magnetic resonance (NMR) and elemental analysis. Compared with non-bloom FA, bloom FA was of lower nitrogen content and higher C/N ratio. It contained more carboxylic and aliphatic groups while less amide groups. 2D-COS-FTIR spectra evidenced the carboxyl groups in bloom FA had the fastest response to Cu(II) binding. Also, polysaccharide in bloom FA was more susceptive to Cu(II) concentrations than that in non bloom FA. While comparing with bloom FA, the N-rich organic compounds in non-bloom FA exhibited faster binding sequence with Cu(II). A comprehensive scheme about the interaction process of FA-Cu(II) showed that both nitrogenous and oxygenic groups in FAs were active in binding to Cu(II). The alteration in binding behaviors of organic groups in FM to Cu(II) may have been driven by algal products and microbial community variety in Taihu Lake. Our results here have the potential to contribute significantly to future studies of dissolved organic matter dynamic biogeochemistry processes and trace metal cycling processes in eutrophic lakes. (C) 2017 Elsevier Ltd. All rights reserved.