| Binding characteristics of Hg(II) with extracellular polymeric substances: implications for Hg(II) reactivity within periphyton | |
Xiang, Yuping ; Liu, Guangliang; Yin, Yongguang; Cai, Yong
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| 2022-08 | |
| Source Publication | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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| ISSN | 0944-1344 |
| Volume | 29Issue:40Pages:60459-60471 |
| Abstract | Periphyton contains extracellular polymeric substances (EPS), yet little is known about how periphyton EPS affect the speciation and mobility of mercury (Hg(II)) in aquatic systems. This study extracted and characterized EPS from periphyton in Florida Everglades, and explored its role in Hg(II) binding and speciation using multiple approaches. Results from Fourier transform infrared spectroscopy (FTIR) revealed that colloidal and capsular EPS were primarily comprised of proteins, polysaccharides, phospholipids, and nucleic acids. Ultrafiltration experiments demonstrated that 77 +/- 7.7% and 65 +/- 5.5% of Hg(II) in EPS solution could be transformed into colloidal and capsular EPS-bound forms. Three-dimensional excitation emission fluorescence spectra (3D-EEMs) showed that the binding constants (K-b) between colloidal/capsular EPS and Hg(II) were 3.47x10(3) and 2.62x10(3) L center dot mol(-1). Together with 3D-EEMs and FTIR, it was found that the protein-like and polysaccharide-like substances in EPS contributed to Hg(II) binding. For colloidal EPS, COO- was the most preferred Hg(II) binding group, while C-N, C-O-C, and C-OH were the most preferred ones in capsular EPS. Using the stannous-reducible Hg approach, it was found that EPS significantly decreased the reactive Hg(II). Overall, this study demonstrated that EPS from periphyton are important organic ligands for Hg(II) complexation, which may further affect the migration and reactivity of Hg(II) in aquatic environment. These observations could improve our understanding of Hg(II) methylation and accumulation within periphyton in aquatic systems. |
| Department | 环境化学与生态毒理学国家重点实验室 ; 环境化学与生态毒理学国家重点实验室 |
| Keyword | DISSOLVED ORGANIC-MATTER PARALLEL FACTOR-ANALYSIS MERCURY METHYLATION ACTIVATED-SLUDGE FLUORESCENCE SPECTROSCOPY METHYLMERCURY PRODUCTION EPS WATER EVERGLADES ADSORPTION |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47477 |
| Collection | 环境化学与生态毒理学国家重点实验室 |
| Corresponding Author | Cai, Yong |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China 2.Florida Int Univ, Dept Chem & Biochem, 11200 SW 8th ST, Miami, FL 33199 USA 3.Florida Int Univ, Southeast Environm Res Ctr, 11200 SW 8th ST, Miami, FL 33199 USA 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China |
| Recommended Citation GB/T 7714 | Xiang, Yuping,Liu, Guangliang,Yin, Yongguang,et al. Binding characteristics of Hg(II) with extracellular polymeric substances: implications for Hg(II) reactivity within periphyton[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2022,29(40):60459-60471. |
| APA | Xiang, Yuping,Liu, Guangliang,Yin, Yongguang,&Cai, Yong.(2022).Binding characteristics of Hg(II) with extracellular polymeric substances: implications for Hg(II) reactivity within periphyton.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,29(40),60459-60471. |
| MLA | Xiang, Yuping,et al."Binding characteristics of Hg(II) with extracellular polymeric substances: implications for Hg(II) reactivity within periphyton".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 29.40(2022):60459-60471. |
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| Binding characterist（1753KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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