Spatial distribution, compositional pattern, and source apportionment of colloidal trace metals in the coastal water of Shandong Peninsula, northeastern China

Yuxi Lu; Dawei Pan

doi:10.1016/j.marpolbul.2024.116445

Spatial distribution, compositional pattern, and source apportionment of colloidal trace metals in the coastal water of Shandong Peninsula, northeastern China

Mar Pollut Bull. 2024 May 10:203:116445. doi: 10.1016/j.marpolbul.2024.116445. Online ahead of print.

Authors

Yuxi Lu¹, Dawei Pan²

Affiliations

¹ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, PR China; Shandong Key Laboratory of Coastal Environmental Processes, Yantai, Shandong 264003, PR China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, PR China; Shandong Key Laboratory of Coastal Environmental Processes, Yantai, Shandong 264003, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: dwpan@yic.ac.cn.

PMID: 38733892
DOI: 10.1016/j.marpolbul.2024.116445

Abstract

The Shandong Peninsula (SP) is the largest peninsula in China hosting rich economic and agricultural activities. In this study, we investigated the behavior of dissolved Mn, Fe, Cu, Zn, Cd, and Pb and their colloidal phases in the coastal and estuarine areas of SP. Pb and Zn had the highest contamination factors of 0.22-10.15 and 0.90-4.41, respectively. The <1 kDa accounted for 23-57 % of the total dissolved phase. Mn, Fe, Cu, Zn, Cd, and Pb were more likely to bind to 100 kDa-0.45 μm colloids (21-57 %). For colloidal Fe and Cu, the adsorption-release behavior had more significant effects on their dynamics. In contrast, the changes in colloidal Mn, Cd, and Pb were mainly controlled by the combined influence of temperature, dissolved oxygen, and microbial activity. However, the 1-3 kDa Zn exhibited a greater pH-dependent dispersion and was significantly positively correlated with it.

Keywords: Biogeochemical characteristics; Coastal environment; Colloidal trace metals; Shandong Peninsula; Size fraction.