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Geochemical sources, deposition and enrichment of heavy metals in short sediment cores from the Pearl River Estuary, Southern China
Qi, S; Leipe, T; Rueckert, P; Di, Z; Harff, J; shiqi@scsio.ac.cn
2010
Source PublicationJOURNAL OF MARINE SYSTEMS
ISSN0924-7963
Volume82Pages:S28-S42
AbstractThe Pearl River Estuary (PRE) is the largest estuary in the Southern China. Four short sediment cores (45 60 cm long) recovered within the PECAI project from the estuary have been analyzed for grain size and geochemistry to reveal geochemical source and deposition environment and to assess enrichment and pollution of heavy metals in the sediments. Four geochemical sources were identified as lithogenic, marine biogenic, anthropogenic and reductive deposit by the correlation analysis and principal component analysis. The representative elements and related elemental ratio reflected different depositional environments in the four cores, which are controlled by the hydrodynamic conditions in the PRE. Core 10W300 190 at the mid West Shoal maintained a constant sub-oxic environment with abundant fluvial deposits; core 10W300 480 at the mouth of the estuary formed an oxic environment influenced by the strong two-layer currents, while two cores (10W300 020 and 10W300 630) at the East Shoal experienced an evident change from marine anoxic condition to a weak anoxic or a sub-oxic condition caused by increasing riverine discharges. According to the enrichment factors (EFs) of heavy metals (Co, Cr, Cu, Hg, Ni, Pb and Zn), there was no significant metal enrichment and contamination in the core sediments in spite of that some metals increased and was partly enriched in the uppermost or surface sediments. Hg was enriched in all four cores due to its non-point sources; enrichment of Cu and Pb in the core 10W300 020 was attributed to the proximity with the point sources of the pollutants. Core 10W300 630, with a constant sedimentation rate of 0.45 cm/a by Cs-137 and Pb-210 dating, exhibits that heavy metals began to increase in the 1960s and increased progressively in the 1980s and 1990s, responding to the rapid economic development in the Pearl River delta region in the last three decades. (C) 2010 Elsevier B.V. All rights reserved.
Department[Qi, Shi; Di, Zhou] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Leipe, Thomas; Rueckert, Peter; Harff, Jan] Leibniz Inst Ostseeforsch Warnemuende, Marine Geol Sect, D-18057 Rostock, Germany; [Rueckert, Peter] Ernst Moritz Arndt Univ Greifswald, Inst Geol Sci, D-17487 Greifswald, Germany
KeywordElements Sources Depositional Environments Enrichment Sediment China Pearl River Estuary
Subject AreaGeosciences, Multidisciplinary ; Marine & Freshwater Biology ; Oceanography
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Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000286126700004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/4292
Collection中科院边缘海地质重点实验室
Corresponding Authorshiqi@scsio.ac.cn
Recommended Citation
GB/T 7714
Qi, S,Leipe, T,Rueckert, P,et al. Geochemical sources, deposition and enrichment of heavy metals in short sediment cores from the Pearl River Estuary, Southern China[J]. JOURNAL OF MARINE SYSTEMS,2010,82:S28-S42.
APA Qi, S,Leipe, T,Rueckert, P,Di, Z,Harff, J,&shiqi@scsio.ac.cn.(2010).Geochemical sources, deposition and enrichment of heavy metals in short sediment cores from the Pearl River Estuary, Southern China.JOURNAL OF MARINE SYSTEMS,82,S28-S42.
MLA Qi, S,et al."Geochemical sources, deposition and enrichment of heavy metals in short sediment cores from the Pearl River Estuary, Southern China".JOURNAL OF MARINE SYSTEMS 82(2010):S28-S42.
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