The distribution and speciation of dissolved Cd and Pb in the Bohai Sea and Yellow Sea, China

Yijun Ren; Xiaojing Wang; Cuiqin Zhang; Jihua Liu; Xuefa Shi; Li Li

doi:10.1016/j.marpolbul.2022.114437

The distribution and speciation of dissolved Cd and Pb in the Bohai Sea and Yellow Sea, China

Mar Pollut Bull. 2023 Jan:186:114437. doi: 10.1016/j.marpolbul.2022.114437. Epub 2022 Dec 7.

Authors

Yijun Ren¹, Xiaojing Wang², Cuiqin Zhang³, Jihua Liu², Xuefa Shi², Li Li⁴

Affiliations

¹ Key Laboratory of Marine Geology and Metallogeny, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China.
² Key Laboratory of Marine Geology and Metallogeny, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China.
³ Key Laboratory of Marine Geology and Metallogeny, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; Education Methodology Newspaper Company, Ltd., Shanxi, China.
⁴ Key Laboratory of Marine Geology and Metallogeny, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China. Electronic address: li.li@fio.org.cn.

PMID: 36495615
DOI: 10.1016/j.marpolbul.2022.114437

Abstract

The speciation of dissolved trace metals is important due to its closely linkage with toxicity and bioavailability in seawater. We investigate the speciation of dissolved Pb (DPb) and Cd (DCd), and their spatial distributions in the Yellow Sea and Bohai Sea, China. The results showed that the organic complexation of DPb and DCd accounted for 35 ± 14 % and 75 ± 10 % of their dissolved concentrations, respectively. The measured free ion activity of Cd ({Cd^{2 +}}) and organic ligand concentration of Cd ([L_Cd]) were highest near the Yellow River mouth, where the free ion activity of Pb ({Pb²⁺}) were also found to be the highest. In this study, both {Pb²⁺} and {Cd²⁺} did not exceed the toxicity threshold, and they were identified not toxic in the waters of the Yellow Sea and Bohai Seas, but biological accumulation effects potentially exist.

Keywords: Bohai Sea; Speciation; Toxicity; Trace metals; Yellow Sea.

MeSH terms

Cadmium*
China
Environmental Monitoring / methods
Lead
Oceans and Seas
Seawater
Water Pollutants, Chemical* / analysis

Substances

Cadmium
Lead
Water Pollutants, Chemical