Microscopic and spectroscopic characterization of humic substances from a compost amended copper contaminated soil: main features and their potential effects on Cu immobilization

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dc.contributor.authorMedina, Jorge
dc.contributor.authorMonreal, Carlos
dc.contributor.authorChabot, Denise
dc.contributor.authorMeier, Sebastian
dc.contributor.authorGonzález Quijon, María
dc.contributor.authorMorales, Esteban
dc.contributor.authorParillo, Rita
dc.contributor.authorBorie, Fernando
dc.contributor.authorCornejo, Pablo
dc.date2017
dc.date.accessioned2021-04-30T17:05:03Z
dc.date.available2021-04-30T17:05:03Z
dc.description.abstractWe characterized humic substances (HS) extracted from a Cu-contaminated soil without compost addition (C) or amended with a wheat straw-based compost (WSC) (H1), co-composted with Fe2O3 (H2), or co-composted with an allophane-rich soil (H3). Extracted HS were characterized under electron microscopy (SEM/TEM), energy-dispersive X-ray (X-EDS), and Fourier transform infrared (FTIR) spectroscopy. In addition, HS extracted from WSC (H4) were characterized at pH 4.0 and 8.0 with descriptive purposes. At pH 4.0, globular structures of H4 were observed, some of them aggregating within a large network. Contrariwise, at pH 8.0, long tubular and disaggregated structures prevailed. TEM microscopy suggests organo-mineral interactions at scales of 1 to 200 nm with iron oxide nanoparticles. HS extracted from soil-compost incubations showed interactions at nanoscale with minerals and crystal compounds into the organic matrix of HS. Bands associated to acidic functional groups of HS may suggest potential sorption interactions with transition metals. We conclude that metal ions and pH have an important role controlling the morphology and configuration of HS from WSC. Characterization of H4 extracted from WSC showed that physicochemical protection of HS could be present in composting systems treated with inorganic materials. Finally, the humified fractions obtained from compost-amended soils may have an important effect on metal-retention, supporting their potential use in metal-contaminated soils.
dc.identifier.citationENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,Vol.24,14104-14116,2017
dc.identifier.doi10.1007/s11356-017-8981-x
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3919
dc.language.isoen
dc.publisherSPRINGER HEIDELBERG
dc.sourceENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
dc.subject.englishComposting
dc.subject.englishCu-contaminated soils
dc.subject.englishFe-HS nanoparticles
dc.subject.englishMetal immobilization
dc.subject.englishOrgano-mineral complexes
dc.titleMicroscopic and spectroscopic characterization of humic substances from a compost amended copper contaminated soil: main features and their potential effects on Cu immobilization
dc.typeArticle
uct.catalogadorWOS
uct.indizacionSCI
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