Remediation of arsenic-cationic metals from smelter contaminated soil by washings of Na2EDTA and phosphoric acid: removal efficiencies and mineral transformation

Sequential and combined soil washing tests of Na 2 EDTA and phosphoric acids were conducted to remediation soil contaminated with arsenic and cationic metals (cadmium, copper, and lead) at a former metal smelter. The aim of the testing was to improve the heavy metals removal efficiency and investiga...

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Bibliographic Details
Published in:Environmental technology 2021-06, Vol.42 (14), p.2211-2219
Main Authors: Wei, Meng, Chen, Jia-Jun, Xia, Chuan-Hai
Format: Article
Language:English
Subjects:
Arsenic
Cadmium
Cations
Combined washing
contaminated soil
Efficiency
Functional groups
Heavy metals
Metal oxides
Metals
Minerals
minerals transformation
oxide species
Phosphoric acid
Pollutant removal
Reforming
Remediation
Sediment pollution
Smelters
Soil contamination
Soil investigations
Soil pollution
Soil remediation
Soil testing
Soils
spectroscopic analysis
Synergistic effect
Washing
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Summary:Sequential and combined soil washing tests of Na 2 EDTA and phosphoric acids were conducted to remediation soil contaminated with arsenic and cationic metals (cadmium, copper, and lead) at a former metal smelter. The aim of the testing was to improve the heavy metals removal efficiency and investigate the mechanism of the influence of soil minerals on washing efficiency, including the influence on soil mineral, metal oxides, and functional groups of soil surface. The results indicated that the combined washing of Na 2 EDTA and phosphoric acid was effective in removing both arsenic and cationic metals from contaminated soil and had synergy effect for most target metals. The results of metal removal efficiency indicated that the washing agent, washing mode, and washing times influenced the removal efficiencies of arsenic and cationic metals. The spectroscopic analysis demonstrated that sequential and combined washings were effective in dissolving and reforming soil minerals compared with single washing. The promoted complexation, ligand exchange, desorption, and inhibition of adsorption resulted in the synergistic effect for most target metals under combined washing.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2019.1696413