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Title: Leachability of arsenic and heavy metals from blasted copper slag and contamination of marine sediment and soil in Ninh Hoa district, south central of Vietnam
Authors: Cappuyns, ValĂ©rie *
Dung, Tran Thi Thu * ×
Swennen, Rudy
Vassilieva, Elvira
Phung, Nguyen Ky #
Issue Date: May-2014
Publisher: Pergamon Press
Series Title: Applied Geochemistry vol:44 pages:80-92
Abstract: In recent years, shipping activities developed in Ninh Hoa district (south-central Vietnam), have raised
an urgent environmental concern related to the use of copper slag as abrasive material for removing rust
from the surface of the ships. This study was conducted to investigate the characteristics of the blasted
copper slag (BCS). Enrichment Factors (EF) were used to assess the contamination status of sediments
and soils in the surroundings of the BCS dump site. The potential release of As and heavy metals
(HMs) from BCS was examined through pHstat and cascade leaching tests in combination with XRD analysis.
From the results, As, Cr, Ni, Pb and Zn were characterized as moderate severely enriched to severely
enriched while Cu showed extremely severe enrichment in the sediments. Regarding the soil collected
at the dump site, it was strongly contaminated with As, Cu and Zn (extremely severe enrichment)
whereas Cr, Ni and Pb were ranked as severely enriched. This study also demonstrates that it is important
to use local background values of As and HMs in soils and sediments for a correct estimation of the
degree of As or HM contamination. The cascade leaching test results from the BCS showed that the concentrations
of the regulated HMs leached were lower than the EU limit for non-hazardous waste; except
for Cu. Results from pHstat leaching tests at pH 4 with BCS indicated that upon acidification, HM release
from the <1 mm fraction is higher compared to the bulk sample. A significant release of Cu from BCS was
also observed for both fractions (<1 mm fraction and bulk sample) in pHstat leaching tests. In view of the
elevated Cu concentrations found in the slag, the potential recovery of Cu from BCS should be
investigated.
ISSN: 0883-2927
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
Department of Earth and Environmental Sciences
Research Centre for Economics and Corporate Sustainability, Campus Brussels
Faculty of Economics and Business (FEB) - miscellaneous
* (joint) first author
× corresponding author
# (joint) last author

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