Trace metal distribution and ecological risk assessment in the core sediments of a highly urbanized tropical mangrove ecosystem, Southwest coast of India

被引:17
作者
Moushmi, K. S. [1 ]
Cheriyan, Anu Susan [1 ]
Cheriyan, Eldhose [1 ]
Mohan, Manu [1 ]
Chandramohanakumar, N. [1 ,2 ]
机构
[1] Cochin Univ Sci & Technol, Sch Marine Sci, Dept Chem Oceanog, Kochi 682016, Kerala, India
[2] Cochin Univ Sci & Technol, Inter Univ Ctr Dev Marine Biotechnol, Sch Marine Sci, Kochi 682016, Kerala, India
关键词
Trace metal; Core sediments; Risk assessment; Organic matter; Mangrove ecosystem; HEAVY-METALS; WEST-COAST; SURFACE SEDIMENTS; MARINE-SEDIMENTS; ESTUARINE SYSTEM; ORGANIC-MATTER; GREY MANGROVE; CONTAMINATION; SPECIATION; IRON;
D O I
10.1016/j.marpolbul.2021.113163
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Distribution and ecological risk assessment of trace metals were carried out in the core sediments of a highly urbanized tropical mangrove ecosystem along the Southwest coast of India. The metal distribution pattern was as follows: Co, Cu, Ni and Pb adsorbed onto Fe oxyhydroxides and fine grained sediments; Cd and Zn preferential adsorption by organic matter and Cr scavenging by Mn oxyhydroxides. Cd, Pb and Zn were significantly enriched in upper sediments, while Cd, Ni and Zn were present in metal exchangeable fractions. Geoaccumulation index (Igeo) suggested that the study area showed moderate to strong pollution of Cd and Zn, whereas unpolluted to moderately polluted with respect to Co, Cr, Cu, Mn, Ni and Pb. Cd enrichment caused high ecological risk, primarily attributed to anthropogenic activities. Mangrove ecosystems are efficient sequester of trace metals but anthropogenic addition can cause significant fraction of exchangeable metals and pose high ecological risk.
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页数:10
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