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Reduction of Pesticide Toxicity Under Field-Relevant Conditions? The Interaction of Titanium Dioxide Nanoparticles, Ultraviolet, and Natural Organic Matter

Luederwald, Simon and Meyer, Frederik and Gerstle, Verena and Friedrichs, Lisa and Rolfing, Katrin and Schreiner, Verena C. and Bakanov, Nikita and Schulz, Ralf and Bundschuh, Mirco (2020). Reduction of Pesticide Toxicity Under Field-Relevant Conditions? The Interaction of Titanium Dioxide Nanoparticles, Ultraviolet, and Natural Organic Matter. Environmental Toxicology and Chemistry. 39 , 2237-2246
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Abstract

In surface waters, the illumination of photoactive engineered nanomaterials (ENMs) with ultraviolet (UV) light triggers the formation of reactive intermediates, consequently altering the ecotoxicological potential of co-occurring organic micropollutants including pesticides due to catalytic degradation. Simultaneously, omnipresent natural organic matter (NOM) adsorbs onto ENM surfaces, altering the ENM surface properties. Also, NOM absorbs light, reducing the photo(cata)lytic transformation of pesticides. Interactions between these environmental factors impact 1) directly the ecotoxicity of photoactive ENMs, and 2) indirectly the degradation of pesticides. We assessed the impact of field-relevant UV radiation (up to 2.6 W UVA/m(2)), NOM (4 mg TOC/L), and photoactive ENM (nTiO(2), 50 mu g/L) on the acute toxicity of 6 pesticides inDaphnia magna. We selected azoxystrobin, dimethoate, malathion, parathion, permethrin, and pirimicarb because of their varying photo- and hydrolytic stabilities. Increasing UVA alone partially reduced pesticide toxicity, seemingly due to enhanced degradation. Even at 50 mu g/L, nano-sized titanium dioxide (nTiO(2)) reduced but also increased pesticide toxicity (depending on the applied pesticide), which is attributable to 1) more efficient degradation and potentially 2) photocatalytically induced formation of toxic by-products. Natural organic matter 1) partially reduced pesticide toxicity, not evidently accompanied by enhanced pesticide degradation, but also 2) inhibited pesticide degradation, effectively increasing the pesticide toxicity. Predicting the ecotoxicological potential of pesticides based on their interaction with UV light or interaction with NOM was hardly possible, which was even more difficult in the presence of nTiO(2). (c) 2020 The Authors.Environmental Toxicology and Chemistrypublished by Wiley Periodicals LLC on behalf of SETAC.

Authors/Creators:Luederwald, Simon and Meyer, Frederik and Gerstle, Verena and Friedrichs, Lisa and Rolfing, Katrin and Schreiner, Verena C. and Bakanov, Nikita and Schulz, Ralf and Bundschuh, Mirco
Title:Reduction of Pesticide Toxicity Under Field-Relevant Conditions? The Interaction of Titanium Dioxide Nanoparticles, Ultraviolet, and Natural Organic Matter
Series Name/Journal:Environmental Toxicology and Chemistry
Year of publishing :2020
Volume:39
Page range:2237-2246
Number of Pages:10
Publisher:WILEY
ISSN:0730-7268
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Photolysis, Photocatalysis, Titanium dioxide, Pesticide, UV radiation, Natural organic matter
URN:NBN:urn:nbn:se:slu:epsilon-p-108133
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108133
Additional ID:
Type of IDID
DOI10.1002/etc.4851
Web of Science (WoS)000572168700001
ID Code:18735
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:25 Nov 2020 09:43
Metadata Last Modified:15 Jan 2021 19:26

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