Mobility of polivinylpyrrolidone coated silver nanoparticles in tropical soils

Autor(es)

Arenas, Alejandro Yopasa ^[1] ; Pessoa, Gustavo de Souza ^[1] ; Zezzi Arruda, Marco Aurelio ^[1] ; Fostier, Anne Helene ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, Dept Analyt Chem, POB 6154, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 194, p. 543-552, MAR 2018.
• Citações Web of Science: 2

Resumo

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 nano particles. 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. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/07384-7 - Bioimageamento elementar por meio da ablação a laser e espectrometria de massas com plasma indutivamente acoplado
• Beneficiário: Marco Aurelio Zezzi Arruda
• Linha de fomento: Auxílio à Pesquisa - Regular