Importance of exposure dynamics of metal-based nano-ZnO, -Cu and -Pb governing the metabolic potential of soil bacterial communities.

2.50
Hdl Handle:
http://hdl.handle.net/10029/621050
Title:
Importance of exposure dynamics of metal-based nano-ZnO, -Cu and -Pb governing the metabolic potential of soil bacterial communities.
Authors:
Zhai, Yujia; Hunting, Ellard R; Wouterse, Marja; Peijnenburg, Willie J G M; Vijver, Martina G
Abstract:
Metal-based engineered nanomaterials (ENMs) are known to affect bacterial processes and metabolic activities. While testing their negative effects on biological components, studies traditionally rely on initial exposure concentrations and thereby do not take into consideration the dynamic behavior of ENMs that ultimately determines exposure and toxicity (e.g. ion release). Moreover, functional responses of soil microbial communities to ENMs exposure can be caused by both the particulate forms and the ionic forms, yet their relative contributions remain poorly understood. Therefore, we investigated the dynamic changes of exposure concentrations of three different types of ENMs (nano-ZnO, -Cu and -Pb) and submicron particles (SMPs) in relation to their impact on the capacity of soil bacterial communities to utilize carbon substrates. The different ENMs were chosen to differ in dissolution potential. The dynamic exposures of ENMs were considered using a time weighted average (TWA) approach. The joint toxicity of the particulate forms and the ionic forms of ENMs was evaluated using a response addition model. Our results showed that the effect concentrations of spherical nano-ZnO, -Cu and SMPs, and Pb-based perovskites expressed as TWA were lower than expressed as initial concentrations. Both particulate forms and ionic forms of spherical 18nm, 43nm nano-ZnO and 50nm, 100nm nano-Cu contribute to the overall response at the EC50 levels. The particulate forms for 150nm, 200nm and 900nm ZnO SMPs and rod-shaped 78nm nano-Cu mainly affected the soil microbial metabolic potential, while the Cu ions released from spherical 25nm nano-Cu, 500nm Cu SMPs and Pb ions released from perovskites mainly described the effects to bacterial communities. Our results indicate that the dynamic exposure of ENMs and relative contributions of particles and ions require consideration in order to pursue a naturally realistic assessment of environmental risks of metal-based ENMs.
Citation:
Importance of exposure dynamics of metal-based nano-ZnO, -Cu and -Pb governing the metabolic potential of soil bacterial communities. 2017, 145:349-358 Ecotoxicol. Environ. Saf.
Journal:
Ecotox Environ Saf 2017, 145:349-58
Issue Date:
Nov-2017
URI:
http://hdl.handle.net/10029/621050
DOI:
10.1016/j.ecoenv.2017.07.031
PubMed ID:
28759764
Type:
Article
Language:
en
ISSN:
1090-2414
Appears in Collections:
Miscellaneous

Full metadata record

DC FieldValue Language
dc.contributor.authorZhai, Yujiaen
dc.contributor.authorHunting, Ellard Ren
dc.contributor.authorWouterse, Marjaen
dc.contributor.authorPeijnenburg, Willie J G Men
dc.contributor.authorVijver, Martina Gen
dc.date.accessioned2018-01-09T12:03:48Z-
dc.date.available2018-01-09T12:03:48Z-
dc.date.issued2017-11-
dc.identifier.citationImportance of exposure dynamics of metal-based nano-ZnO, -Cu and -Pb governing the metabolic potential of soil bacterial communities. 2017, 145:349-358 Ecotoxicol. Environ. Saf.en
dc.identifier.issn1090-2414-
dc.identifier.pmid28759764-
dc.identifier.doi10.1016/j.ecoenv.2017.07.031-
dc.identifier.urihttp://hdl.handle.net/10029/621050-
dc.description.abstractMetal-based engineered nanomaterials (ENMs) are known to affect bacterial processes and metabolic activities. While testing their negative effects on biological components, studies traditionally rely on initial exposure concentrations and thereby do not take into consideration the dynamic behavior of ENMs that ultimately determines exposure and toxicity (e.g. ion release). Moreover, functional responses of soil microbial communities to ENMs exposure can be caused by both the particulate forms and the ionic forms, yet their relative contributions remain poorly understood. Therefore, we investigated the dynamic changes of exposure concentrations of three different types of ENMs (nano-ZnO, -Cu and -Pb) and submicron particles (SMPs) in relation to their impact on the capacity of soil bacterial communities to utilize carbon substrates. The different ENMs were chosen to differ in dissolution potential. The dynamic exposures of ENMs were considered using a time weighted average (TWA) approach. The joint toxicity of the particulate forms and the ionic forms of ENMs was evaluated using a response addition model. Our results showed that the effect concentrations of spherical nano-ZnO, -Cu and SMPs, and Pb-based perovskites expressed as TWA were lower than expressed as initial concentrations. Both particulate forms and ionic forms of spherical 18nm, 43nm nano-ZnO and 50nm, 100nm nano-Cu contribute to the overall response at the EC50 levels. The particulate forms for 150nm, 200nm and 900nm ZnO SMPs and rod-shaped 78nm nano-Cu mainly affected the soil microbial metabolic potential, while the Cu ions released from spherical 25nm nano-Cu, 500nm Cu SMPs and Pb ions released from perovskites mainly described the effects to bacterial communities. Our results indicate that the dynamic exposure of ENMs and relative contributions of particles and ions require consideration in order to pursue a naturally realistic assessment of environmental risks of metal-based ENMs.en
dc.language.isoenen
dc.rightsArchived with thanks to Ecotoxicology and environmental safetyen
dc.subject.meshCalcium Compounds-
dc.subject.meshCarbon-
dc.subject.meshCopper-
dc.subject.meshIons-
dc.subject.meshLead-
dc.subject.meshMicrobial Consortia-
dc.subject.meshNanoparticles-
dc.subject.meshNetherlands-
dc.subject.meshOxides-
dc.subject.meshParticle Size-
dc.subject.meshSoil-
dc.subject.meshSoil Microbiology-
dc.subject.meshSoil Pollutants-
dc.subject.meshTitanium-
dc.subject.meshZinc Oxide-
dc.titleImportance of exposure dynamics of metal-based nano-ZnO, -Cu and -Pb governing the metabolic potential of soil bacterial communities.en
dc.typeArticleen
dc.identifier.journalEcotox Environ Saf 2017, 145:349-58en

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