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Issue 10, 2020
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Environmental context determines the impact of titanium oxide and silver nanoparticles on the functioning of intertidal microalgal biofilms

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Abstract

Coastal environments are receiving habitats for most nanoparticle (NP) waste. Coastal sediments, into which NPs accumulate, support microalgal biofilms that provide important ecosystem processes: primary production, enhanced sediment stabilisation, and nutrient recycling. We assessed the impact of realistic concentrations of titanium oxide (TiO2) and silver (Ag) NPs on marine microalgal biofilms and associated ecosystem processes in simulated natural conditions, by exposing natural biofilms to TiO2 and Ag-NPs for one-month periods in outdoor tidal mesocosms under three contrasted environmental contexts (seasons). Ag-NPs had no significant effects on microalgal biomass, sediment biostabilisation potential and sediment–water oxygen and nutrient fluxes, even at concentrations (25 μg l−1) higher than current estimated levels (25 ng l−1). TiO2-NPs had no significant effect at current expected concentrations (25 μg l−1), but higher concentrations (25 mg l−1) resulted in decreased microalgal biomass; decreased ability of biofilms to biostabilise sediment, therefore limiting their coastal protection potential; reduced primary production and modified nutrient recycling. TiO2-NPs impacts were dependent on the environmental context: most effect was seen in winter, while no toxicity on biofilms was demonstrated in early spring. Our findings demonstrate that while Ag-NPs, being liable to dissolution into Ag+ ions under the conditions tested, are not expected to have an environmental impact if current predictions of environmental loading prevail, TiO2-NPs may have ecological consequences in coastal environments in addition to direct impacts on microbial biomass.

Graphical abstract: Environmental context determines the impact of titanium oxide and silver nanoparticles on the functioning of intertidal microalgal biofilms

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Supplementary files

Article information


Submitted
28 Apr 2020
Accepted
03 Aug 2020
First published
14 Sep 2020

This article is Open Access

Environ. Sci.: Nano, 2020,7, 3020-3035
Article type
Paper

Environmental context determines the impact of titanium oxide and silver nanoparticles on the functioning of intertidal microalgal biofilms

C. Passarelli, X. Cui, E. Valsami-Jones and G. J. C. Underwood, Environ. Sci.: Nano, 2020, 7, 3020
DOI: 10.1039/D0EN00440E

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