Article

Heavy metal contamination in surface sediments of Yangtze River intertidal zone: an assessment from different indexes.

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China.
Environmental pollution (Barking, Essex: 1987) (impact factor: 3.43). 03/2009; 157(5):1533-43. DOI:10.1016/j.envpol.2009.01.007 pp.1533-43
Source: PubMed

ABSTRACT Surface sediments (0-5 cm) from 59 stations within the Yangtze River intertidal zone (YRIZ) were sampled for metal contamination analysis in April and August 2005. The concentrations ranged (in mg kg(-1) dry weight): Al, 40,803-97,213; Fe, 20,538-49,627; Cd, 0.12-0.75; Cr, 36.9-173; Cu, 6.87-49.7; Mn, 413-1,112; Ni, 17.6-48.0; Pb, 18.3-44.1; and Zn, 47.6-154; respectively. Among the 59 sampling stations, enrichment factors (EF) indicate enrichment of Cd (52 stations), Cr (54 stations), Cu (5 stations), Ni (26 stations), Pb (5 stations) and Zn (5 stations). Geoaccumulation indexes (I(geo)) also suggest individual metal contamination in localized areas. This study indicates that Cd, Cr and Ni enrichment in the YRIZ sediment is widespread whereas Cu, Mn, Pb and Zn enrichment is localized or nonexistent. Factor and cluster analyses indicate that Cd is associated with total organic carbon whereas Cu, Cr, Ni, Pb and Zn have a close association with Mn.

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Keywords

26 stations
 
5 stations
 
52 stations
 
54 stations
 
59 sampling stations
 
59 stations
 
cluster analyses
 
enrichment
 
enrichment factors
 
Fe
 
Geoaccumulation indexes
 
individual metal contamination
 
localized areas
 
metal contamination analysis
 
Ni enrichment
 
Surface sediments
 
total organic carbon
 
Yangtze River intertidal zone
 
YRIZ sediment
 
Zn enrichment
 

Weiguo Zhang