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Mobility of polivinylpyrrolidone coated silver nanoparticles in tropical soils.
Yopasá Arenas, Alejandro; de Souza Pessôa, Gustavo; Arruda, Marco Aurélio Zezzi; Fostier, Anne Hélène.
Afiliação
  • Yopasá Arenas A; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
  • de Souza Pessôa G; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
  • Arruda MAZ; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
  • Fostier AH; Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil. Electronic address: fostier@iqm.unicamp.br.
Chemosphere ; 194: 543-552, 2018 Mar.
Article em En | MEDLINE | ID: mdl-29241128
Experiments in saturated soil columns were performed to investigate the transport and retention of 25 nm and 75 nm silver nanoparticles stabilized with polyvinylpyrrolidone (PVP-AgNPs) in two Brazilian soils (sandy and sandy-clay). The normalized concentration of the PVP-AgNPs was obtained through a flow injection analysis method based on the surface plasmon ressonance effect of the metallic nanoparticles. The use of the ultraviolet-visible spectroscopy (UV-Vis) allows a rapid and low-cost analysis. The obtained breakthrough curves (BCs) were modeled with a deterministic model of solute transport in steady conditions of water flow and considering two regions of non-physical equilibrium; this model allowed the determination of the hydrodynamic parameters. It was found that the process occurs in condition of non-equilibrium, with a low mass transfer for larger NP, and that the process is predominantly advective and affected by the pore size of the soil packed in the columns. The BCs for PVP-AgNPs obtained by UV-Vis spectroscopy were compared with the BCs obtained by ICP-MS and with BCs of the bromide anion, confirming that the nanoparticles have a low retention and few modifications when transported through the soil column. These PVP-AgNPs are highly mobile and can be transported through the studied tropical soils, representing a potential environmental problem, due to the possibility of these materials reaching groundwater. On the contrary, the conservative behavior of PVP-AgNPs in the studied tropical soils, indicates its potential use as tracers, substituting the bromide anion which has been demonstrated to be not a good tracer in the same conditions.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Solo / Povidona / Nanopartículas Metálicas Tipo de estudo: Prognostic_studies País/Região como assunto: America do sul / Brasil Idioma: En Revista: Chemosphere Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Solo / Povidona / Nanopartículas Metálicas Tipo de estudo: Prognostic_studies País/Região como assunto: America do sul / Brasil Idioma: En Revista: Chemosphere Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido