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Sci Total Environ. 2017 Jan 1;574:1633-1639. doi: 10.1016/j.scitotenv.2016.08.204. Epub 2016 Sep 6.

Bioaccumulation of silver in Daphnia magna: Waterborne and dietary exposure to nanoparticles and dissolved silver.

Author information

1
Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-093 Aveiro, Portugal. Electronic address: ribeiro.f@ua.pt.
2
Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
3
Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-093 Aveiro, Portugal.

Abstract

Silver nanoparticles (Ag-NP) are incorporated into commercial products as antimicrobial agents, which potentiate their emission to the environment. The toxicity of Ag-NP has been associated with the release of Ag ions (Ag+), which are more toxic to aquatic organisms than Ag-NP. In this study, a toxicokinetics approach was applied to compare the potential of Daphnia magna to accumulate Ag from either Ag-NP or AgNO3 through different exposure routes: a) water, b) diet and c) water and diet. A one-compartment kinetics model was applied to describe the development of Ag body concentrations over time and derive uptake (k1w; k1d) and elimination (k2) rate constants. Under water-only exposure, AgNO3 induced higher Ag uptake rate constants and bioconcentration factors when compared to Ag-NP. For dietary exposure, no differences in Ag concentrations in D. magna, along with the kinetics parameters, were found for both Ag forms. Simultaneous water and dietary exposures to Ag-NP induced higher Ag concentrations in D. magna compared to AgNO3. In this combined exposure, uptake from water explains most for the increase in Ag body concentration in D. magna for Ag-NP exposure, whereas uptake from the diet was the major contributor for the increase in Ag concentration in D. magna under AgNO3 exposure. Biomagnification was not observed for any of the exposure routes applied in this study, neither for Ag-NP nor for AgNO3.

KEYWORDS:

Bioaccumulation; Daphnia magna; Dietary exposure, trophic transfer; Silver nanoparticles

PMID:
27613676
DOI:
10.1016/j.scitotenv.2016.08.204
[Indexed for MEDLINE]

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