Extraction characteristics of heavy metals from marine sediments
- Extraction characteristics of heavy metals from marine sediments
- 유종찬; 이차돌; 양중석; 백기태
- Marine sediment; Chelation; Complexation; Fractionation; Heavy metals
- Issue Date
- Chemical engineering journal
- VOL 228, 688-699
- In this study, the feasibility of a washing process to extract Cd, Cu, Ni, Pb, and Zn from three real dredged
marine sediments (Namhang (NH), Bangeojin (BE), and Haengam (HA) bay sediments, South Korea) were
investigated using various washing agents (ethylenediaminetetraacetic acid (EDTA), NaCl, HCl, sodium
citrate, and HNO3). Even though the removal efficiencies of heavy metals were not high, which is thought
to be largely due to the high concentrations of Fe and Ca, EDTA was a more efficient extraction agent for
heavy metals compared to the other agents, because EDTA formed more stable complexes with metals.
EDTA removed: 30%, 43%, and 9% of Cu; 48%, 66%, and -8% of Pb; and 31%, 60%, and -14% of Zn from
NH, BE, and HA sediments, respectively. Additionally, fractionation analysis showed that EDTA converted
the strongly bound fractions of Cu and Pb to an exchangeable fraction. Based on the experimental results,
the washing technique using EDTA is determined to be efficient for the removal Cu, Pb, and Zn from NH
and BE sediment samples. On the contrary, residual concentrations of heavy metals were not decreased
from HA samples compared to extraction with washing solution because of the high content of fine particles
and organic matter in samples. Furthermore, the fractionations of metals highly influenced the
chemical extraction of metals in sediments, and the fractionation changes after chemical washing
increased the total extractable amount of metals. As a result, the fractionation change caused changes
in the bioavailability and potential mobility of metals.
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