Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam

Historical profiles of trace element concen-trations were reconstructed from two mangrove sediment cores collected within the Ba Lat Estuary (BLE), Red River, Vietnam. Chronologies of sedi-ment cores were determined by the 210 Pb method, which showed that each respective sediment core from the south and north entrances of BLE provided a record of sediment accumulation spanning approxi-mately 100 and 60 years. The profiles of Pb, Zn, Cu, Cr, V, Co, Sb, and Sn concentrations markedly increased from the years of the 1920s–1950s, and leveled out from 1950s–1980s, and then gradually decreased from 1980s to present. The profiles of Cd and Ag concentrations increased from 1920s–1940s, and then decreased from 1940s to present. The profile of Mo concentrations progressively increased from 1920s–1980s, then decreased to present. The Mn concentrations failed to show a clear trend in both sediment cores. Results from contamination factors, Pearson’s correlation, and hierarchical cluster analysis suggest that the trace elements were likely attributed to discharge of untreated effluents from industry, domestic sewage, as well as non-point sources. Pollution Load Index (PLI) revealed levels higher than other mangrove sediment studies, and the long-term variations in PLI matched significant socioeco-nomic shifts and population growth in Vietnam. Geoaccumulation Index showed that mangrove sedi-ments were moderately polluted by Pb and Ag, and from unpolluted to moderately polluted by Zn, Cu, and Sb. The concentrations of Pb, Zn, Cu, Cr, and Cd exceeded the threshold effect levels and effect range low concentrations of sediment quality guidelines, implying that the sediments may be occasionally associated with adverse biological effects to benthic organisms.

Title:	Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam
Authors:	Nguyen Tai Tue Tran Dang Quy Amano, Atsuko Mai Trong Nhuan Atsuko Amano
Keywords:	Historical profiles. Trace element Mangrove sediment Ba Lat Estuary Vietnam
Issue Date:	2012
Publisher:	SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Citation:	ISIKNOWLEDGE
Abstract:	Historical profiles of trace element concen-trations were reconstructed from two mangrove sediment cores collected within the Ba Lat Estuary (BLE), Red River, Vietnam. Chronologies of sedi-ment cores were determined by the 210 Pb method, which showed that each respective sediment core from the south and north entrances of BLE provided a record of sediment accumulation spanning approxi-mately 100 and 60 years. The profiles of Pb, Zn, Cu, Cr, V, Co, Sb, and Sn concentrations markedly increased from the years of the 1920s–1950s, and leveled out from 1950s–1980s, and then gradually decreased from 1980s to present. The profiles of Cd and Ag concentrations increased from 1920s–1940s, and then decreased from 1940s to present. The profile of Mo concentrations progressively increased from 1920s–1980s, then decreased to present. The Mn concentrations failed to show a clear trend in both sediment cores. Results from contamination factors, Pearson’s correlation, and hierarchical cluster analysis suggest that the trace elements were likely attributed to discharge of untreated effluents from industry, domestic sewage, as well as non-point sources. Pollution Load Index (PLI) revealed levels higher than other mangrove sediment studies, and the long-term variations in PLI matched significant socioeco-nomic shifts and population growth in Vietnam. Geoaccumulation Index showed that mangrove sedi-ments were moderately polluted by Pb and Ag, and from unpolluted to moderately polluted by Zn, Cu, and Sb. The concentrations of Pb, Zn, Cu, Cr, and Cd exceeded the threshold effect levels and effect range low concentrations of sediment quality guidelines, implying that the sediments may be occasionally associated with adverse biological effects to benthic organisms.
Description:	TNS06905 ; WATER AIR AND SOIL POLLUTION Volume: 223 Issue: 3 Pages: 1315-1330 Published: MAR 2012
URI:	http://repository.vnu.edu.vn/handle/VNU_123/27493 http://link.springer.com/article/10.1007/s11270-011-0947-x
ISSN:	0049-6979
Appears in Collections:	Bài báo của ĐHQGHN trong Web of Science