Characterization and stability of sedimentary colloids in different ecology regions in Taihu Lake

Xin HU; Jing LI; Juan WANG; Li YIN; Kaipian SHI; Heyong HUANG; Yong ZHANG; Shiyin LI

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Characterization and stability of sedimentary colloids in different ecology regions in Taihu Lake

Chemistry | Updated：2024-10-12

- Characterization and stability of sedimentary colloids in different ecology regions in Taihu Lake
- Journal of Oceanology and Limnology Vol. 41, Issue 6, Pages: 2146-2159(2023)
- Affiliations：
  
  1.School of Environment, Nanjing Normal University, Nanjing 210023, China
  2.Analysis and Testing Center of Nanjing Normal University, Nanjing Normal University, Nanjing 210023, China
  3.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
  4.Department of Geological Sciences, University of Alabama, Tuscaloosa AL 35487, USA
  5.Jiangsu Open Laboratory of Large-scale Scientific Instruments, Nanjing Normal University, Nanjing 210023, China
- Author bio：
  
  ‍: hhynjnu@126.com
  lishiyin@njnu.edu.cn
- Funds：
- DOI：
  CLC：
- Received：07 July 2022，
  
  Accepted：15 August 2022，
  
  Online First：19 September 2022，
  
  Published：01 November 2023
- Accepted：
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HU Xin,LI Jing,WANG Juan,et al.Characterization and stability of sedimentary colloids in different ecology regions in Taihu Lake[J].Journal of Oceanology and Limnology,2023,41(06):2146-2159.
DOI：

HU Xin,LI Jing,WANG Juan,et al.Characterization and stability of sedimentary colloids in different ecology regions in Taihu Lake[J].Journal of Oceanology and Limnology,2023,41(06):2146-2159. DOI：

摘要

Abstract

Colloidal particles

heterogeneous mixture with various organic components and continuous molecular weight (MW) distribution

is omnipresent in lake sediments and substantially influence the retention

transportation

and fate of contaminants in lake ecosystem. We sampled and extracted sedimentary colloids from different ecology regions in Taihu Lake

Jiangsu

East China

in June 2020

and they were further separated into four different particle size ranges by tangent ultrafiltration

and the properties of colloids were studied in various methods

including zeta potential analysis

transmission electron micrograph images (TEM)

Fourier transformation infrared (FTIR)

and 3D fluorescence. Results show that the surface of the colloids is covered with organic macromolecular substances

such as humus-like substances and protein-like substances. There were significant differences in molecular weight and fraction content of colloids in the sediments from macrophyte-dominant (MD) area and algae-dominant (AD) area in the lake. Colloids from MD area are mainly composed of humic acid

protein

and fulvic acid; the content of fulvic acid is lower than that of humic acid and protein. The humic acid exists mainly in small molecular weight (10‍‍–‍‍‍100‍ ‍kDa)

protein exists in mainly large molecular weight colloids (0.45‍–‍‍1 ‍μm). Colloids from AD area are mainly composed of humic acid

and mainly distributed in the molecular weight (10 ‍kDa‍–‍0.45‍ ‍μm). The presence of humic acid inhibits effectively the agglomeration of the colloids. Especially

the stability of colloids is closely related to the molecular weight

with low molecular weight from MD area show higher stability. The existence of humic acid in colloids increases the electrostatic repulsion between colloidal particles

which can effectively inhibit the agglomeration of colloids

thus enhancing the stability of colloids. Furthermore

both monovalent and divalent electrolytes enhance colloidal aggregation

and the low‍-‍molecular-weight (LMW) colloid fraction exhibits higher stability efficiency than the high-molecular‍-‍weight (HMW) colloidal.

关键词

Keywords

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Related Institution

Department of Geological Sciences, University of Alabama, Tuscaloosa

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CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences

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Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology

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