Yoo, Jong-Chan Lee, Cha-Dol Yang, Jung-Seok Baek, Kitae 2024-01-20T12:01:57Z 2024-01-20T12:01:57Z 2021-09-05 2013-07-15 1385-8947 https://pubs.kist.re.kr/handle/201004/127870 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. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA SUBSTANCE-ENHANCED ULTRAFILTRATION CONTAMINATED DREDGED SEDIMENT 3-STEP SEQUENTIAL EXTRACTION CHELANT-ASSISTED REMEDIATION CHELATING-AGENTS HARBOR SEDIMENT CITRIC-ACID SOIL REMOVAL EDTA Extraction characteristics of heavy metals from marine sediments Article 10.1016/j.cej.2013.05.029 1 CHEMICAL ENGINEERING JOURNAL, v.228, pp.688 - 699 CHEMICAL ENGINEERING JOURNAL 228 688 699 scie scopus 000326203500074 2-s2.0-84878911164 Engineering, Environmental Engineering, Chemical Engineering Article SUBSTANCE-ENHANCED ULTRAFILTRATION CONTAMINATED DREDGED SEDIMENT 3-STEP SEQUENTIAL EXTRACTION CHELANT-ASSISTED REMEDIATION CHELATING-AGENTS HARBOR SEDIMENT CITRIC-ACID SOIL REMOVAL EDTA Marine sediment Chelation Complexation Fractionation Heavy metals