Tracking relevant nanomaterial transformations, exposure, uptake and effects in freshwater and soil systems

Lead Research Organisation: NERC Centre for Ecology and Hydrology
Department Name: Pollution (Wallingford)

Abstract

Nanomaterials (NM) are very small particles much less than the width of a human hair. They are synthesised to provide different properties from larger forms of the same material and they are now used in a wide range of products. The properties that NMs provide include enhanced strength, an ability to reflect light or to react with other chemicals, and efficient electrical conductance. The value of NM is now very widely recognised and many companies are starting to use them in common consumer products, such as sunscreens and cosmetics, plus industry products, such as fabrics and building materials. This means that small quantities of NMs will reach the wider environment from everyday product use.

A great deal of recent research has gone into assessing the safety of NMs for humans and the environment. Most of these studies have looked at NMs in their newly-manufactured forms. It is increasingly apparent, however, that once NMs are released into the wider environment, they do not stay in their manufactured state - they change or 'transform'. Transformations can affect NM size, charge, their surface coatings and their ability to bind to other things such as soil particles or other chemicals. Transformations occur both during transfer to the environment (e.g. via sewage works) and once NMs reach the wider environment itself (rivers, sediments and soils). It is of huge importance that we understand the transformation processes and environmental fate(s) of NMs as they can affect their toxicity to humans and the environment.

The aim of this project is to study these NM transformations in more detail. We want to better understand whether different types of NMs are transformed in the same or different ways. We will conduct our work with different types of NMs, including those made from silver, titanium dioxide, polystyrene (a type of plastic) and graphene (a type of carbon).

We will first use laboratory methods that mimic the ways that NMs are changed during sewage treatment and in natural waters and soils to create the transformed materials that we will then study. We will test how these new and changed NMs affect a range of common aquatic and soil organisms and contrasting their toxicity in their "pristine" state with that after they have been transformed in the environment for different times. During our tests, we will measure how much of each material is taken up by the organisms into different tissues and whether this affects how they grow and reproduce. We will also measure the activity of different genes that are likely to be affected as organisms take up different NMs. We predict that each NM will be transformed in a way that changes its likelihood to cause harmful effects. Each test will be repeated using different soils and waters typically found across the UK, to determine how transformations vary under different conditions.

Finally, we will build custom-made, large exposure systems ('mesocosms') designed to mimic the rivers into which sewage works discharged and soils upon which sludge is spread, and populate them with a wide range of common UK native plants, invertebrates and fish (in the waters). By following these mesocosms for several months, we can simulate what may actually be happening in real UK environments in terms of the fate and effects of our transformed NMs. We will use the results to improve models able to predict how our transformed NMs will behave and the effects they will have. Taken together, our results should help us to predict the toxicity of NMs to help assure their safety, supporting the growth of the nanotechnology industry into the future. To this latter end we will run and coordinate a UK Nano-Academics & Regulators Platform, and will also present our results through major European Union (NanoSafety Cluster) and worldwide (Organisation for Economic Cooperation and Discussion) policy working groups, as well as to the public, so reaching as wide an audience as possible.

Planned Impact

Given the global economic importance of the nanotechnology industry - currently in $ billions worldwide - our findings will be of considerable interest (inter)nationally to a wide range of industries, government regulatory bodies, environmental protection groups and the general public. The major part of our impact activities will be centred on engagement with national and international government regulatory bodies, industry partners, and informing the wider public, as well as on training and incorporating outcomes into higher education.

Our work will benefit regulators and industry by delivering advanced understanding of realistic environment fate and effects of nanomaterials. This knowledge will focus on the mitigation of highly reactive nanomaterial surfaces afforded by environmental transformations, through detailed comparison of the bioaccumulation and toxicity of the pristine and environmentally-transformed forms under realistic chemistries and concentrations. Protocols, methods and models for assessing nanomaterials environmental transformations, and their effects on toxicity will be an outcome of our work. The central dissemination component for this information will be the UK Nano-Academics & Regulators Platform, which has been initiated by UoB and CEH over the last year with support from Defra, EA and CEFAS, and which will be formalised and secured via this project. The 6-monthly meetings of this group over the 3 year project will allow 2-way communication between regulators and academics/industry, facilitating coordination of UK responses to OECD and other international activity, briefing of the academic community of upcoming impact opportunities/research needs, and allowing the academics to relay relevant research outcomes directly to policy makers. This activity will be supplemented if applicable, a joint science-workshop with any other project(s) funded via the Highlight Topic call.

The applicants have considerable experience of commercial engagement via EU consortia, CASE studentships, the NERC-nanoKTN, and KTP and LINK awards with various industry partners. The project team also has a strong track record in actively supporting UK and international governments for screening and testing guidelines, including for nanomaterials, and policy development via a number of routes (e.g. Defra reports, ECHA workshops, OECD test guidelines, European Food Safety Authority, EU Nanosafety cluster). All of these links will provide conduits for knowledge sharing and for creating impact with industry and government bodies.
Results of this work are expected to make a significant scientific impact and major routes for scientific dissemination will be via relevant, high impact ISI scientific journals, and national and international conferences and workshops. The applicants will also disseminate knowledge from this research work via the press (through the CEH & NERC Press Office), to industry and regulators, and into higher education (UoB and UoEx directly, but invited lectures e.g. Oxford nano-summerschool). For wider public disseminations, we will run a two-day public outreach activity, which will include opportunities to view the soil mesocosm experiments, as well as, interactive sessions on the benefits and opportunities of nanomaterials and challenges in detecting nanomaterials in the environment.

The researchers on this project will be provided with the opportunity to develop their awareness of, and skills in, knowledge transfer, designating major roles for the project researchers in the UK Nano-Academics & Regulators Platform, and the outreach activities, as well as in science communication. The participating laboratories have impressive records in employment for their researchers that include permanent positions in academia (both nationally and internationally), and within various industries and government agencies. Our continued development of skilled staff for UK PLC will be a major impact of our project work.

Publications

10 25 50
 
Description We have shown variation in species sensitivity to different nanoparticles related to chemistry to other properties. We have identified that some particles may show greater toxicity when exposed under sunlight that in dark conditions.
Exploitation Route Development of better methods for nanomateiral risk assessment and management. Help to industry to develop safer nanotechnology products.
Sectors Chemicals,Manufacturing, including Industrial Biotechology

 
Description We have established a group to exchange information between UK Environmental Nanoscience academics and regulatory agencies. This means that the research in this project directly informs UK policy makers on the current state of the art of the field. We have invited representatives from the other two Highlight Topic funded project to meeting of this group.
First Year Of Impact 2016
Sector Chemicals,Environment,Manufacturing, including Industrial Biotechology
Impact Types Policy & public services

 
Description Assessment of revised OECD test guideline for Nanomaterial as UK representative appointed by Defra
Geographic Reach Europe 
Policy Influence Type Participation in a advisory committee
Impact Developed and reviewed OECD new test guideline for dissolution, aggregation, transformation, and bioaccumulation for nanomaterials on behalf of Defra based on project generated knowledge of assay methods.
 
Description Coordination of UK Expert Network in Environmental Nanomateiral Toxicology
Geographic Reach Multiple continents/international 
Policy Influence Type Participation in a advisory committee
Impact As part of the impact plan of this project, the PI Spurgeon and CoPI Lynch have coordinated meetings of a working group comprising academics and policy stakeholders (Defra, EA, PHE, HSE) to share current information of the needs and development of an approach for the risk assessment of nanomaterials present in nanoenabled products. Information from this project presented at this face-to-face meeting has been brought forward to the OECD Working Party on Manufactured Nanomaterials and to the European Chemicals Agency who are in the process of drafting Annexes to the REACH Chemical policy that will shape the risk assessment and management of nanomaterials and associated nanotechnology products for the next 25 years.
 
Description Coordination of advisory committee - Expert Network in Environmental Nanomateiral Toxicology (2018)
Geographic Reach Europe 
Policy Influence Type Participation in a advisory committee
Impact Coordination of UK PK Expert Network in Environmental Nanomaterial Toxicology to bring together researchers and regulators with interest in developing a scientifically based framework for the risk assessment of nanomaterials as part of the development of REACH Annexes and associated standard test and assay guideline through ECHA and OECD.
 
Description Grouping, Read-Across, CharacterIsation and classificatiOn framework for regUlatory risk assessment of manufactured nanomaterials and Safer design of nano-enabled products (GRACIOUS)
Amount € 8,000,000 (EUR)
Funding ID 760840 
Organisation European Union 
Sector Public
Country European Union (EU)
Start 01/2018 
End 12/2022
 
Description Graphene and graphene oxide bioaccumulation in soil bacteria and invertebrates 
Organisation Imperial College London
Department Department of Materials
Country United Kingdom 
Sector Academic/University 
PI Contribution Design of bioaccumulation studies to investigate graphene and graphene oxide accumulation by soil bacterial species and nematodes
Collaborator Contribution Supply of graphene and graphene oxides and analysis of localisation in biological samples
Impact Biological samples and associated data
Start Year 2018
 
Description Attendance at OECD NanoREG meeting on nanomateiral risk assessment practice and procedures 
Form Of Engagement Activity A formal working group, expert panel or dialogue
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Industry/Business
Results and Impact CEH PI and CoPI Spurgeon and Svendsen and Birmingham PI Lynch played an active role at a meeting organised by the OECD and EU NanoREG project that aimed to review the current state of the art of nanomateiral risk assessment. Parties from both partner organisations either presented or led discussion groups at this meeting, which was attended by over 200 stakeholder primarily in the nanotechnology sector or regulatory policy field. This output from this meeting will play an important role in the development of new nanomaterial risk assessment and risk governance policy by the European Chemicals Agency. UK science funded by NERC will play a vital role in the ecological risk assessment area.
Year(s) Of Engagement Activity 2016
 
Description Nanoecotoxicology - Are we getting the hazard assessment of nanomaterials right? 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Postgraduate students
Results and Impact Presentation to Israeli scientists and policymakers on Nanomaterial hazard assessment
Year(s) Of Engagement Activity 2017
 
Description Project contribution to New Tools and Approaches for Nanomaterial Safety Assessment Conference, Malaga, Spain 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact Presentation of hypotheses and data arising from work in this project at an EU funded workshop on New Tools and Approaches for Nanomaterial Safety Assessment Conference. Meeting was attended by a significant number of major industries and policy makers for with and outside of Europe.
Year(s) Of Engagement Activity 2017
 
Description Raporteur for OECD workshop on Nanomaterial grouping and read across in ecotoxicology 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Policymakers/politicians
Results and Impact Rapporteur at an OECD hosted workshop on the development of approaches for grouping and read across of the toxicity of nanomaterials for humans and ecosystems.
Year(s) Of Engagement Activity 2018
 
Description UK Regualtors Academic Group on Environmental Nanoscience 
Form Of Engagement Activity A formal working group, expert panel or dialogue
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Policymakers/politicians
Results and Impact Working group formed comprising of major regulators and academic groups in UK to exchange information on the research and regulatory aspects of environmental nanoscience and nanotoxicology. Group contains represnetative from Defa, EA, SEPA, PHE, HSE, NGOs, KT Networks and Research Centres/Universities. Three meeting have been ehld to data, with more planned for 2012.
Year(s) Of Engagement Activity 2016