The distribution and risk assessment of metals in surface sediments of the Laizhou Bay in the Bohai Sea

HU Ningjing; LIU Jihua; HUANG Peng; SHI Xuefa; ZHU Aimei; MA Deyi

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HU Ningjing, LIU Jihua, HUANG Peng, SHI Xuefa, ZHU Aimei, MA Deyi. The distribution and risk assessment of metals in surface sediments of the Laizhou Bay in the Bohai Sea[J]. Haiyang Xuebao, 2012, 34(2): 92-100.

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HU Ningjing, LIU Jihua, HUANG Peng, SHI Xuefa, ZHU Aimei, MA Deyi. The distribution and risk assessment of metals in surface sediments of the Laizhou Bay in the Bohai Sea[J]. Haiyang Xuebao, 2012, 34(2): 92-100.

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The distribution and risk assessment of metals in surface sediments of the Laizhou Bay in the Bohai Sea

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2009-12-29
Rev Recd Date: 2010-08-09

Abstract

Abstract

The contents of metals in surface sediments of the Laizhou Bay in the Bohai Sea were determined by the X-ray fluorescence, the inductively coupled plasma mass spectroscopy or the atomic fluorescence spectrometer. Results show that the contents of copper,zinc,lead,cadmium,nickel,chromium,cobalt,vanadium,scandium,iron and manganese decrease gradually from the coastal area to the central, and their contents are higher in the southern area than those in the northern. However, the relatively higher contents of silven were observed in the middle-southwestern sea of this area. A risk assessment of heavy metals, based on the marine sediment quality standards, indicates that adverse biological effects caused by arsenic and nickel occasionally may take place in the sediments of the Laizhou Bay. Enrichment factors were calculated to weigh whether the contents observed represented background or contaminate levels. The results reveal three groups of elements: (1)Iron,copper,zinc,cadmium,nickel,cobalt,manganese,vanadium and scandium are at background contents; (2)arsenic is the slight enriched element; and (3)lead and silven are the moderate enriched elements. A principal component analysis and EFs reveal that iron,copper,zine,cadmium,arsenic chromium,nickel,cobalt,manganese,vanadium and scandium are mainly originated from terrestrial (rock and soil)weathering, lead may have some anthropogenic sources, and silver in sediments is mainly derived from anthropogenic sources.A cluster analysis showed that the sediments from 31 stations could be divided into four groups. Two zones were identified to be relatively heavy contaminated by both arsenic and nickel in the bay. One was the northwest of the Huanghe Estuary and the other was the central-north side of the Laizhou Bay.
- metals,
- sediments,
- pollution,
- sources,
- Laizhou Bay

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References(41)

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