Abstract
Purpose
This study investigated the spatial and temporal changes of elemental concentrations and their influencing factors, based on geochemical analysis of four sediment cores collected from the eastern shelf of Hainan Island, South China Sea, with different distance gradients from the coast.
Methods
Samples used in the study, the four sedimentary cores C1, C2, C3, and C4, were all collected from the eastern Hainan shelf in the South China Sea. The concentrations of trace elements were measured by inductively coupled plasma-mass spectrometry (ICP-MS). We use X-ray fluorescence spectrometer (XRF) to measure concentrations of major elements. Combined with MS, TN, TOC, and particle size data, and then, multiple statistical analysis methods including correlation, principal component, and cluster analyses, these are comprehensively used.
Results
Spatially, the contents of metallic elements are closely related to offshore distance. In terms of temporal distribution, the concentrations of Cu, Zn, As, Pb, Ni, and Cr overall increase from the bottom toward the surface.
Conclusion
The cores show a simultaneous increase with the economic and social development of Hainan Island and the implementation of related policies. The metallic and metalloid elements in the sediments are mainly affected by the input of terrigenous debris and maritime materials. Redox conditions may also influence the geochemical characteristics of some elements such as As and Cr.
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Data will be made available on request.
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Acknowledgements
The open scientific expedition cruise to the Western South China Sea in 2013 and Rong Xiang are acknowledged and thanked for their assistance in sample collection. The authors thank Zixuan Rao for her great help with the laboratory analysis and other work.
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This work was funded by the National Natural Science Foundation of China (Grant Nos.: 41976191 and 42276240) and the strategic Priority Research Program of Chinese Academy of Sciences (Grant No.: XDB40000000).
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Zhuo Chen: methodology, visualization, investigation, writing—original draft preparation; Libin Wu: supervision, investigation, validation, writing—reviewing and editing; Liqiang Xu: investigation, writing—reviewing and editing; Xiaodong Liu: supervision, funding acquisition, resources, writing—reviewing and editing.
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Chen, Z., Wu, L., Xu, L. et al. Environmental implications of spatial and temporal distributions of multiple metallic elements in marginal marine sediments from Eastern Hainan Island, South China Sea. J Soils Sediments 23, 2564–2583 (2023). https://doi.org/10.1007/s11368-023-03524-9
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DOI: https://doi.org/10.1007/s11368-023-03524-9