DC FieldValueLanguage
dc.contributorDepartment of Civil and Environmental Engineeringen_US
dc.creatorCui, JLen_US
dc.creatorZhao, YPen_US
dc.creatorChan, TSen_US
dc.creatorZhang, LLen_US
dc.creatorTsang, DCWen_US
dc.creatorLi, XDen_US
dc.date.accessioned2021-05-18T08:20:37Z-
dc.date.available2021-05-18T08:20:37Z-
dc.identifier.issn0304-3894en_US
dc.identifier.urihttp://hdl.handle.net/10397/90064-
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectContaminated sitesen_US
dc.subjectCopperen_US
dc.subjectMetal uptakeen_US
dc.subjectPhytostabilizationen_US
dc.subjectRhizosphereen_US
dc.subjectSynchrotron-based X-ray techniquesen_US
dc.titleSpatial distribution and molecular speciation of copper in indigenous plants from contaminated mine sites : implication for phytostabilizationen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume381en_US
dc.identifier.doi10.1016/j.jhazmat.2019.121208en_US
dcterms.abstractContaminated mining sites require ecological restoration work, of which phytoremediation using appropriate plant species is an attractive option. Our present study is focused on one typical contaminated mine site with indigenous plant cover. The X-ray absorption near edge structure (XANES) analysis indicated that Cu (the major contaminant) was primarily associated with goethite (adsorbed fraction), with a small amount of Cu oxalate-like species (organic fraction) in mine affected soil. With growth of plant species like Miscanthus floridulus and Stenoloma chusanum, the Cu-oxalate like organic species in rhizosphere soil significantly increased, with corresponding decrease in Cu-goethite. In the root cross-section of Miscanthus floridulus, synchrotron-based micro-X-ray fluorescence (μ-XRF) microscopy and micro-XANES results indicated that most Cu was sequestered around the root surface/epidermis, primarily forming Cu alginate-like species as a Cu-tolerance mechanism. From the root epidermis to the cortex and vascular bundle, more Cu(I)-glutathione was observed, suggesting reductive detoxification ability of Cu(II) to Cu(I) during the transport of Cu in the root. The observation of Cu-histidine in root internal cell layers showed another Cu detoxification pathway based on coordinating amino ligands. Miscanthus floridulus showed ability to accumulate phosphorous and nitrogen nutrients in rhizosphere and may be an option for in situ phytostabilization of metals in contaminated mining area.en_US
dcterms.accessRightsembargoed accessen_US
dcterms.bibliographicCitationJournal of hazardous materials, 5 Jan. 2020, v. 381, 121208en_US
dcterms.isPartOfJournal of hazardous materialsen_US
dcterms.issued2020-01-
dc.identifier.scopus2-s2.0-85072606904-
dc.identifier.pmid31563672-
dc.identifier.eissn1873-3336en_US
dc.identifier.artn121208en_US
dc.description.validate202105 bchyen_US
dc.description.oaNot applicableen_US
dc.identifier.FolderNumbera0683-n07-
dc.description.fundingSourceRGCen_US
dc.description.fundingSourceOthersen_US
dc.description.fundingTextThe work was supported by the National Natural Science Foundation of China (41603093), the National Basic Research Program of China (973 Program, 2014CB441101), and the RGC Collaborative Research Fund (RGC C7044-14G).en_US
dc.description.pubStatusPublisheden_US
dc.date.embargo2022.01.05en_US
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