广东沿海沉积物重金属含量及风险评价

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Abstract

The data of heavy metal content in sediments of costal area of Guangdong Province were collected and its ecological risks were assessed using the Hakanson's potential ecological risk index. Based on social, economic and natural aspects, the major factors affecting the heavy metals content were investigated. Results showed that the contents of various heavy metals in sediments of Pearl River Estuary were significantly higher than that of the eastern or western coastal regions of Guangdong. The highest contents of Cu (106.98±70.69μg/g) and Pb (65.74±65.03μg/g) were recorded in Guangzhou and Shenzhen among all the coastal areas, whereas the highest contents of Zn (250.25±55.01μg/g), Cd (1.48±0.30μg/g), Cr (96.48±9.79μg/g) and As (17.30±14.00μg/g) were recorded in Zhongshan. Hakanson potential ecological risk assessment showed that the individual index (0.528±0.377~2.107±3.665) and the comprehensive index (7.135±7.880) of Guangdong coast were overall low. The results from single factor ecological risk assessment indicated that the order of ecological risk for the six heavy metals was Cd > Cu > Pb > Zn > As > Cr, and the order of ecological risk index was the Pearl River Estuary (12.131) > eastern coastal regions of Guangdong (5.488) > western coastal regions of Guangdong (4.1560). Significant correlations were found between the contents of Cu, Pb, Zn, Cd and Cr in the sediments (P<0.05), indicating the homologous sources. The contents of Cu, Pb and Zn in sediments were positively correlated with TOC (P<0.05), while the contents of Cu, Cr and Cd in sediments were negatively correlated with pH values (P<0.05).

Key words： Guangdong coastal areas heavy metals sediments ecological risk assessment

Received: 16 May 2018

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	ZHANG Qi-yuan
	LIU Xu-cheng
	ZHAO Jian-gang
	LIU Xiang-hua

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ZHANG Qi-yuan,LIU Xu-cheng,ZHAO Jian-gang等. Contents and risk assessment of heavy metal sediments in Guangdong coastal areas[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4653-4660.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I12/4653

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