Enhanced removal of arsenic and cadmium from contaminated soils using a soluble humic substance coupled with chemical reductant.

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dc.citation.volume220
dc.contributor.authorWei J
dc.contributor.authorTu C
dc.contributor.authorXia F
dc.contributor.authorYang L
dc.contributor.authorChen Q
dc.contributor.authorChen Y
dc.contributor.authorDeng S
dc.contributor.authorYuan G
dc.contributor.authorWang H
dc.contributor.authorJeyakumar P
dc.contributor.authorBhatnagar A
dc.coverage.spatialNetherlands
dc.date.available2023-03-01
dc.date.available2022-12-18
dc.date.issued2023-03-01
dc.descriptionCAUL read and publish agreement 2023
dc.description.abstractSoil washing is an efficient, economical, and green remediation technology for removing several heavy metal (loid)s from contaminated industrial sites. The extraction of green and efficient washing agents from low-cost feedback is crucially important. In this study, a soluble humic substance (HS) extracted from leonardite was first tested to wash soils (red soil, fluvo-aquic soil, and black soil) heavily contaminated with arsenic (As) and cadmium (Cd). A D-optimal mixture design was investigated to optimize the washing parameters. The optimum removal efficiencies of As and Cd by single HS washing were found to be 52.58%-60.20% and 58.52%-86.69%, respectively. Furthermore, a two-step sequential washing with chemical reductant NH2OH•HCl coupled with HS (NH2OH•HCl + HS) was performed to improve the removal efficiency of As and Cd. The two-step sequential washing significantly enhanced the removal of As and Cd to 75.25%-81.53% and 64.53%-97.64%, which makes the residual As and Cd in soil below the risk control standards for construction land. The two-step sequential washing also effectively controlled the mobility and bioavailability of residual As and Cd. However, the activities of soil catalase and urease significantly decreased after the NH2OH•HCl + HS washing. Follow-up measures such as soil neutralization could be applied to relieve and restore the soil enzyme activity. In general, the two-step sequential soil washing with NH2OH•HCl + HS is a fast and efficient method for simultaneously removing high content of As and Cd from contaminated soils.
dc.description.publication-statusPublished
dc.format.extent115120 - ?
dc.identifierhttps://www.ncbi.nlm.nih.gov/pubmed/36563980
dc.identifierS0013-9351(22)02447-1
dc.identifier.citationEnviron Res, 2023, 220 pp. 115120 - ?
dc.identifier.doi10.1016/j.envres.2022.115120
dc.identifier.eissn1096-0953
dc.identifier.elements-id458702
dc.identifier.harvestedMassey_Dark
dc.languageeng
dc.relation.isPartOfEnviron Res
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0013935122024471?via%3Dihub
dc.subjectArsenic
dc.subjectCadmium
dc.subjectChemical reductant
dc.subjectHumic substance
dc.subjectSequential soil washing
dc.subjectHumic Substances
dc.subjectCadmium
dc.subjectArsenic
dc.subjectReducing Agents
dc.subjectMetals, Heavy
dc.subjectSoil
dc.subjectSoil Pollutants
dc.subjectEnvironmental Restoration and Remediation
dc.subject.anzsrc03 Chemical Sciences
dc.subject.anzsrc05 Environmental Sciences
dc.subject.anzsrc06 Biological Sciences
dc.titleEnhanced removal of arsenic and cadmium from contaminated soils using a soluble humic substance coupled with chemical reductant.
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Agriculture & Environment
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