汕头湾表层沉积物重金属污染与潜在生态风险评价

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Abstract

Shantou estuary is not only one of most important area for navigation in southern China,but also play a significant role in aquiculture and tourism in Shantou city.A science and technology project for marine development was started in 2002,because the pollution situation of Shantou estuary was so serious and hamper the local economic development.As a part of this research, the pollution degrees and the potential ecological risks associated with heavy metals content and distribution pattern in surface sediment of Shantou estuary were assessed with the method of single factor pollution index,marine sediment quality and Hakanson's potential ecological index.The results showed that:the average contents of Cd,Cu,Zn,Pb in surface sediment of Shantou estuary were higher than marine sediment quality standards(Ⅰ).Based on the single factor pollution index of target heavy metals,the surface sediment of Shantou estuary have to be considered as most strongly polluted with Cd,strongly polluted with Zn and moderately polluted with Cu,Ni,Pb.Based on ecological risk factor(E_rⁱ),the potential ecological risk to the Shantou estuary contamination was very strong with Cd,and only slight with other elements.Based on the multi-elements potential ecological risk indices(RI),the Shantou estuary was moderately polluted by heavy metals.The spatial difference of heavy metal pollution and their potential ecological risk have a consistent pattern with that of heavy metals content,which showed a decrease trend as waves from upstream to downstream of Shantou Estuary with a distinct peak in Niutanyang and upper region of Shantou harbor.This phenomenon maybe caused by the river inlet,sewer outlet distribution pattern in the study region, together with geographical and hydrological characteristics of Shantou estuary.

Key words： Shantou estuary surficial sediment heavy metal pollution potential ecological risk

Received: 25 August 2010

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	Articles by authors
	QIAO Yong-min
	ZHAO Jian-gang
	YANG Yang
	GU Ji-guang
	HUANG Chang-jiang

Cite this article:

QIAO Yong-min,ZHAO Jian-gang,YANG Yang, et al. Evaluation on the pollution and potential ecological risk of heavy metals for the surface sediment in Shantou estuary[J]. , 2010, 29(4): 312-317.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I4/312

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