Retention and remobilization mechanisms of environmentally aged silver nanoparticles in an artificial riverbank filtration system

The Science of the Total Environment
Laura DegenkolbSondra Klitzke

Abstract

Riverbank filtration systems are important structures that ensure the cleaning of infiltrating surface water for drinking water production. In our study, we investigated the potential risk for a breakthrough of environmentally aged silver nanoparticles (Ag NP) through these systems. Additionally, we identified factors leading to the remobilization of Ag NP accumulated in surficial sediment layers in order to gain insights into remobilization mechanisms. We conducted column experiments with Ag NP in an outdoor pilot plant consisting of water-saturated sediment columns mimicking a riverbank filtration system. The NP had previously been aged in river water, soil extract, and ultrapure water, respectively. We investigated the depth-dependent breakthrough and retention of NP. In subsequent batch experiments, we studied the processes responsible for a remobilization of Ag NP retained in the upper 10 cm of the sediments, induced by ionic strength reduction, natural organic matter (NOM), and mechanical forces. We determined the amount of remobilized Ag by ICP-MS and differentiated between particulate and ionic Ag after remobilization using GFAAS. The presence of Ag-containing heteroaggregates was investigated by combining filtration wi...Continue Reading

Citations

Feb 28, 2019·Analytical and Bioanalytical Chemistry·Dominic Brucker, Kerstin Leopold
Oct 16, 2020·Critical Reviews in Analytical Chemistry·Daniel Armando CamposAllan Philippe
Nov 2, 2019·The Science of the Total Environment·Laura DegenkolbSondra Klitzke
Jun 24, 2021·Analytical Methods : Advancing Methods and Applications·Eduardo BoleaFrancisco Laborda
Jun 13, 2021·The Science of the Total Environment·Lina Ramirez ArenasSerge Stoll

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