Behaviour of titanium dioxide and zinc oxide nanoparticles in the presence of wastewater-derived organic matter and implications for algal toxicity

Neale, Peta A., Jamting, Asa K., O'Malley, Elissa, Herrmann, Jan and Escher, Beate I. (2015) Behaviour of titanium dioxide and zinc oxide nanoparticles in the presence of wastewater-derived organic matter and implications for algal toxicity. Environmental Science: Nano, 2 1: 86-93. doi:10.1039/c4en00161c


Author Neale, Peta A.
Jamting, Asa K.
O'Malley, Elissa
Herrmann, Jan
Escher, Beate I.
Title Behaviour of titanium dioxide and zinc oxide nanoparticles in the presence of wastewater-derived organic matter and implications for algal toxicity
Journal name Environmental Science: Nano   Check publisher's open access policy
ISSN 2051-8161
2051-8153
Publication date 2015-02-01
Year available 2014
Sub-type Article (original research)
DOI 10.1039/c4en00161c
Open Access Status Not yet assessed
Volume 2
Issue 1
Start page 86
End page 93
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Subject 2501 Materials Science (miscellaneous)
2300 Environmental Science
Abstract The properties of engineered nanomaterials (ENMs), such as their small size and increased reactivity, enable their use in a wide range of products; however, these attributes may also pose an environmental hazard. Wastewater effluent is expected to be a significant source of ENMs to the aquatic environment. Little is known about the behaviour and effect of ENMs in this complex matrix. The aim of this study was to assess the effect of titanium dioxide (TiO) and zinc oxide (ZnO) ENMs on microalgae Pseudokirchneriella subcapitata in wastewater effluent and compare with more commonly tested matrices, specifically Talaquil growth media and Suwannee River humic acid. To better understand the toxicity results, ENM concentration, size and streaming potential in the different experimental matrices were assessed. The different media types had a significant influence on TiO behaviour, with TiO settling out of solution within the first 24 hours in wastewater. However, as TiO was not toxic to algae at the studied concentration, no difference in effect was observed between media, humic acid and wastewater. In contrast, media types had less of an influence on ZnO behaviour, with growth inhibition observed in all three media types at 72 hours, although the presence of organic matter delayed inhibition slightly. The results demonstrate that organic matter properties can have a significant influence on ENM behaviour, and while this did not translate into an effect on algae in the current study, it is still important to consider ENM behaviour and fate when working in different matrices.
Formatted abstract
The properties of engineered nanomaterials (ENMs), such as their small size and increased reactivity, enable their use in a wide range of products; however, these attributes may also pose an environmental hazard. Wastewater effluent is expected to be a significant source of ENMs to the aquatic environment. Little is known about the behaviour and effect of ENMs in this complex matrix. The aim of this study was to assess the effect of titanium dioxide (TiO2) and zinc oxide (ZnO) ENMs on microalgae Pseudokirchneriella subcapitata in wastewater effluent and compare with more commonly tested matrices, specifically Talaquil growth media and Suwannee River humic acid. To better understand the toxicity results, ENM concentration, size and streaming potential in the different experimental matrices were assessed. The different media types had a significant influence on TiO2 behaviour, with TiO2 settling out of solution within the first 24 hours in wastewater. However, as TiO2 was not toxic to algae at the studied concentration, no difference in effect was observed between media, humic acid and wastewater. In contrast, media types had less of an influence on ZnO behaviour, with growth inhibition observed in all three media types at 72 hours, although the presence of organic matter delayed inhibition slightly. The results demonstrate that organic matter properties can have a significant influence on ENM behaviour, and while this did not translate into an effect on algae in the current study, it is still important to consider ENM behaviour and fate when working in different matrices.
Keyword Chemistry, Multidisciplinary
Environmental Sciences
Nanoscience & Nanotechnology
Chemistry
Environmental Sciences & Ecology
Science & Technology - Other Topics
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID LP100200276
Institutional Status UQ
Additional Notes Published online ahead of print 24 Nov 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
National Research Centre for Environmental Toxicology Publications
 
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