Investigating spectroscopic and copper-binding characteristics of organic matter derived from sediments and suspended particles using EEM-PARAFAC combined with two-dimensional fluorescence/FTIR correlation analyses
Investigating spectroscopic and copper-binding characteristics of organic matter derived from sediments and suspended particles using EEM-PARAFAC combined with two-dimensional fluorescence/FTIR correlation analyses
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使用 EEM-PARAFAC 结合二维荧光/FTIR 相关分析研究沉积物和悬浮颗粒中有机物的光谱和铜结合特征
DOI：
10.1016/j.chemosphere.2018.11.113
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发表时间：
2019-03-01
期刊：
影响因子：
8.8
通讯作者：
Shi, Yue
中科院分区：
文献类型：
--
作者：
Hu, Bin;Wang, Peifang;Shi, Yue
由于沉积物有机质和悬浮颗粒有机质的环境动力学特征不同，其与重金属的相互作用也存在很大差异。以太湖和洪泽湖两个大型浅水湖泊的沉积物和悬浮颗粒物为研究对象，采用光谱法研究了有机质和悬浮颗粒物的特征和铜结合特性的差异。结果表明，太湖SPOM以原生类酪氨酸物质为主，而洪泽湖SPOM以陆源类腐殖物质为主。太湖和洪泽湖的溶解性有机质分别受内源蛋白质和陆源腐殖物质的控制。两湖悬浮颗粒物中有机质含量的比较表明，不同的有机质来源可能是造成两湖悬浮颗粒物中有机质特征的主要原因。同时，相对较高的结合亲和力和更多的结合位点，观察到SPOM在两个湖泊相比，SOM通过二维相关光谱（2D-COS）的同步荧光光谱分析。此外，FTIR光谱的2D-COS分析显示疏水基团（即，酚基）比亲水基具有更高的结合亲和力（即，多糖基团）的SOM和SPOM。研究结果为认识浅水湖泊中悬浮颗粒物提供了一个新的视角，悬浮颗粒物在重金属环境行为中的作用可能比以往认为的更为重要。(C)2018爱思唯尔有限公司版权所有
Different environmental dynamics of sediment organic matter (SOM) and suspended particulate organic matter (SPOM) result in great disparities in characteristics and subsequent interactions with heavy metals. In this study, sediments and suspended particles were collected from two large and shallow lakes (Taihu and Hongze Lake) to study the difference in the characteristics and copper binding properties between SOM and SPOM through spectroscopy method. Our results showed that SPOM in Taihu Lake was dominated by autochthonous tyrosine-like substance and SOM was dominated by terrestrial humic-like substance, whereas SPOM in Hongze Lake was dominated by terrestrial humic-like substances. Furthermore, dissolved organic matter (DOM) in Taihu and Hongze Lake was controlled by autochthonous protein and terrestrial humic substances, respectively. Comparison of SPOM between these two lakes indicated that various organic matter sources could be responsible for the organic matter characteristics in suspended particles. Meanwhile, relatively higher binding affinities and more binding sites were observed for SPOM in both two lakes compared to SOM through two-dimensional correlation spectroscopy (2D-COS) analysis of synchronous fluorescence spectra. Moreover, 2D-COS analysis of FTIR spectra revealed that hydrophobic groups (i.e., phenolic groups) had higher binding affinity than hydrophilic groups (i.e., polysaccharide groups) for both SOM and SPOM. Our results provide a new angle for understanding the suspended particles in shallow lakes, which might play a more important role in the environmental behaviors of heavy metals, than has been previously thought. (C) 2018 Elsevier Ltd. All rights reserved.