Concentration distribution and assessment of several heavy metals in sediments of west-four Pearl River Estuary |
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| Authors: | Shanshan Wang Zhimin Cao Dongzhao Lan Zhichang Zheng Guihai Li |
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| Institution: | (1) College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China;(2) Third Institute of Oceanography, SOA, Xiamen, 361005, China;(3) Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou, 510760, China |
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| Abstract: | Grain size parameters, trace metals (Co, Cu, Ni, Pb, Cr, Zn, Ba, Zr and Sr) and total organic matter (TOM) of 38 surficial
sediments and a sediment core of west-four Pearl River Estuary region were analyzed. The spacial distribution and the transportation
procession of the chemical element in surficial sediments were studied mainly. Multivariate statistics are used to analyses
the interrelationship of metal elements, TOM and the grain size parameters. The results demonstrated that terrigenous sediment
taken by the rivers are main sources of the trace metal elements and TOM, and the lithology of parent material is a dominating
factor controlling the trace metal composition in the surficial sediment. In addition, the hydrodynamic condition and landform
are the dominating factors controlling the large-scale distribution, while the anthropogenic input in the coastal area alters
the regional distribution of heavy metal elements Co, Cu, Ni, Pb, Cr and Zn. The enrichment factor (EF) analysis was used
for the differentiation of the metal source between anthropogenic and naturally occurring, and for the assessment of the anthropogenic
influence, the deeper layer content of heavy metals were calculated as the background values and Zr was chosen as the reference
element for Co, Cu, Ni, Pb, Cr and Zn. The result indicate prevalent enrichment of Co, Cu, Ni, Pb and Cr, and the contamination
of Pb is most obvious, further more, the peculiar high EF value sites of Zn and Pb probably suggest point source input. |
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| Keywords: | West-four Pearl River Estuary Surficial sediment Heavy metals Depositional environment Enrichment factor (EF) |
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