Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary,Red River,Vietnam |
| |
Authors: | Nguyen Tai Tue Tran Dang Quy Atsuko Amano Hideki Hamaoka Shinsuke Tanabe Mai Trong Nhuan Koji Omori |
| |
Institution: | (1) Center for Marine Environmental Studies, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Japan;(2) Faculty of Geology, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam;(3) Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8567, Japan |
| |
Abstract: | Historical profiles of trace element concentrations were reconstructed from two mangrove sediment cores collected within the
Ba Lat Estuary (BLE), Red River, Vietnam. Chronologies of sediment cores were determined by the 210Pb method, which showed that each respective sediment core from the south and north entrances of BLE provided a record of
sediment accumulation spanning approximately 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 socioeconomic shifts and population growth in Vietnam. Geoaccumulation
Index showed that mangrove sediments 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|