农业环境科学学报2024，Vol.43Issue(6)：1377-1388,12.DOI:10.11654/jaes.2023-0718
人工湿地中沉积物溶解性有机质与Cd结合机制
Mechanism of binding between dissolved organic matter and cadmium in constructed wetland sediments:taking a constructed wetland in Zhuzhou City as an example
摘要
Abstract
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.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Key words
dissolved organic matter/constructed wetland sediment/cadmium/combination process/two-dimensional correlation spectroscopy分类
资源环境引用本文复制引用
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[J].农业环境科学学报,2024,43(6):1377-1388,12.基金项目
湖南省高新技术产业科技创新引领计划项目(2020NK2001) （2020NK2001）
国家重点研发计划项目(2017YFD0801505) High Technology Industry S&T Innovation Leading Project of Hunan Province,China(2020NK2001) （2017YFD0801505）
National Key Research and Development Program of China(2017YFD0801505) （2017YFD0801505）
