人工湿地中沉积物溶解性有机质与Cd结合机制——以株洲市某人工湿地为例

张威宇; 李伟峻; 刘玉玲; 姚俊帆; 晏德; 李南; 铁柏清

文章摘要

张威宇,李伟峻,刘玉玲,姚俊帆,晏德,李南,铁柏清.人工湿地中沉积物溶解性有机质与Cd结合机制——以株洲市某人工湿地为例[J].农业环境科学学报,2024,43(6):1377-1388.

人工湿地中沉积物溶解性有机质与Cd结合机制——以株洲市某人工湿地为例

Mechanism of binding between dissolved organic matter and cadmium in constructed wetland sediments： taking a constructed wetland in Zhuzhou City as an example

投稿时间：2023-09-05

DOI：10.11654/jaes.2023-0718

中文关键词: 溶解性有机质人工湿地沉积物镉结合过程二维相关光谱

英文关键词: dissolved organic matter constructed wetland sediment cadmium combination process two-dimensional correlation spectroscopy

基金项目:湖南省高新技术产业科技创新引领计划项目（2020NK2001）；国家重点研发计划项目（2017YFD0801505）

作者	单位	E-mail
张威宇	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128
李伟峻	湖南农业大学环境与生态学院, 长沙 410128
刘玉玲	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128
姚俊帆	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128
晏德	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128
李南	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128
铁柏清	湖南农业大学环境与生态学院, 长沙 410128 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙 410128 农业农村部南方产地污染防控重点实验室, 长沙 410128	tiebq@qq.com

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中文摘要:

为探究人工湿地不同季节的溶解性有机质（DOM）组分变化以及与Cd之间的相互作用及差异，本研究利用紫外光谱、荧光光谱、傅里叶变换红外光谱（FTIR）和 X射线光电子能谱（XPS）等多种光谱表征技术，并结合平行因子分析（PARAFAC）和二维相关光谱（2D-COS）分析对春秋两季湿地沉积物中DOM进行深入探讨。研究发现，湿地沉积物DOM主要来源于微生物活动、植物凋落物和根系分泌物，亲水性强且芳香性较低。春季与秋季的DOM含量分别为434 mg·kg^-1和700 mg·kg^-1，其中春季主要由两种类蛋白和两种腐殖质组成，而秋季则为一种类蛋白和三种腐殖质。各组分与Cd的淬灭过程主要是静态淬灭，其中春季的蛋白质残基表现出最为明显的淬灭效果，存在两类以上结合位点，而秋季的类蛋白和类富里酸为单齿络合物。类蛋白和类富里酸与Cd的结合比其他组分更为强烈且稳定，并且类蛋白质组分与Cd优先结合。结合过程中，Cd主要与DOM的酰胺、酚羟基、羧基官能团相互作用，其中酰胺的结合速率最快，其次是酚羟基和羧基。

英文摘要:

In this study, the changes of differences between the components of sedimentary dissolved organic matter（DOM）in different seasons and stages of a constructed wetland, as well as their binding interactions with cadmium（Cd）, were investigated. Various spectral characterization techniques, such as ultraviolet spectroscopy, fluorescence spectroscopy, Fourier-transform infrared spectroscopy（FTIR）, and X-ray photoelectron spectroscopy（XPS）, as well as parallel factor analysis（PARAFAC）and two-dimensional correlation spectroscopy （2D-COS）, were used to analyze the DOM in the wetland sediments in spring and autumn. The results revealed that the DOM components in the wetland sediments were mainly derived from microbial activities, plant litter, and root exudates and were strongly hydrophilic and low in aromatics. The DOM contents in spring and autumn were 434 mg·kg^-1 and 700 mg·kg^-1, respectively, with those in spring being mainly composed of two kinds of proteins and two kinds of humus, while those in autumn comprised one kind of protein and three kinds of humus. Static quenching was the main Cd-quenching process of each DOM component, among which the protein residues in spring showed the most obvious effect with more than two types of binding sites. By contrast, the protein-and fulvic acid-like compounds in autumn formed monodentate complexes. Compared with the other components, the proteinoids and fulvic acid bound more strongly and stably to Cd, with binding between the proteinoids and Cd being preferred. In the binding process, Cd mainly interacted with the amide, phenolic hydroxyl, and carboxyl functional groups of DOM, with the amide group showing the fastest binding rate, followed by the phenolic hydroxyl and carboxyl groups.

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