Spatial and environmental characteristics of colloidal trace Cu in the surface water of the Yellow River Estuary, China

Yuxi Lu; Dawei Pan; Tingting Yang; Chenchen Wang

doi:10.1016/j.marpolbul.2021.112401

Spatial and environmental characteristics of colloidal trace Cu in the surface water of the Yellow River Estuary, China

Mar Pollut Bull. 2021 Jul:168:112401. doi: 10.1016/j.marpolbul.2021.112401. Epub 2021 Apr 25.

Authors

Yuxi Lu¹, Dawei Pan², Tingting Yang³, Chenchen Wang¹

Affiliations

¹ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: [email protected].
³ College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, PR China.

PMID: 33910074
DOI: 10.1016/j.marpolbul.2021.112401

Abstract

Dynamic variations in chemical composition and size distribution of dissolved copper (Cu) along the river-sea interface in the Yellow River Estuary (China) were investigated. On average, ~64% and ~8% of bulk dissolved Cu (<0.45 μm) were partitioned in the <1 kDa fraction and 1-100 kDa, respectively. The other 28% were in the 100 kDa-0.45 μm colloids, which indicates that this fraction may dominate the overall morphology of colloidal Cu. The <3 kDa Cu fraction was susceptible to environmental parameters and the >3 kDa fraction was related to the behavior of dissolved organic carbon. 1-100 kDa Cu migrated more violently than >100 kDa Cu and tended to be a stable polymer, with stability increasing towards the sea. The source of <1 kDa Cu was complex and may be supplemented by the decomposition of small molecular colloids and the addition of the sediments or particles ligands.

Keywords: Biogeochemistry; Centrifugal ultrafiltration; Colloidal copper; Dynamic variation; Yellow River Estuary.

MeSH terms

China
Environmental Monitoring
Estuaries*
Geologic Sediments
Rivers
Water
Water Pollutants, Chemical* / analysis

Substances

Water Pollutants, Chemical
Water