Title: Distribution and contamination status of heavy metals in estuarine sediments near Cua Ong Harbour, Ha Long Bay, Vietnam
Authors: Ho, Huu Hieu ×
Swennen, Rudy
Van Damme, An #
Issue Date: 2010
Series Title: Geologica Belgica vol:13 issue:1-2 pages:37-47
Abstract: The distribution, controlling geochemical factors and contamination status of heavy metals in estuarine
sediments near Cua Ong Habor, Ha Long Bay (Vietnam) were investigated. 36 surface sediment samples were collected
and analyzed for major elements (Al, Ca, Fe, K, Mg, S), heavy metals (As, Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn), organic
matter, loss on ignition (LOI), grain size composition and pH. Spatial distribution patterns of heavy metals as well as their
controlling factors were elucidated based on geochemical mapping and statistical methods such as the Pearson Product-
Moment linear correlation and Factor Analysis. The results illustrated that the distribution patterns of As, Cd, Cr, Cu, Ni,
Pb and Zn are mainly controlled by organic matter and clay minerals and determined by the distribution of the finegrained
fraction (Φ < 63 μm) in the sediments. In contrast, Fe and Mn compounds seem to exert some control on the
distribution of Co. Carbonates partly control the distribution of Mn, but are not important with respect to the other studied
heavy metals. The contamination status by heavy metals was assessed based on comparison with Canadian, Wisconsin-
United States and Flemish numerical Sediment Quality Guidelines, and calculation of Geo-accumulation Index (Igeo) and
Enrichment Factor (EF). The results indicated that natural processes such as weathering and erosion of bedrock are the
main supply sources of heavy metals in sediments near Cua Ong Harbor. Among the studied heavy metals, only As is of
concern whereas Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn seem to reflect their background concentrations in sediments of Ha
Long Bay.
ISSN: 1374-8505
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
× corresponding author
# (joint) last author

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