NER: Identifying & Regulating Environmental Impacts of Nanotechnology PI: N. Swami; Co-PI: M. Gorman; Students (Degree Program): A. Wardak (Ph.D.), E.

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Presentation transcript:

NER: Identifying & Regulating Environmental Impacts of Nanotechnology PI: N. Swami; Co-PI: M. Gorman; Students (Degree Program): A. Wardak (Ph.D.), E. Fauss (MS), S. Deshpande (MS); University of Virginia, Charlottesville, VA Rationale Realizing market potential of nanotechnology, requires upstream identification of uncertainties: risk & opportunity What are some of the uncertainties? No real-time monitoring & protection technology Toxic effects at cellular or tissue levels Classification & Nomenclature for Regulation Multifunctional Systems that defy easy classification System-level effects: Cascading, Interactive, Embedded Project Goals Developing a framework to identify the risks and impacts: –Estimating risks from a study of potential hazards and exposure scenarios –Including Regulatory & Knowledge Gaps in risk identification strategy Methodology to weigh benefits against risks Pathways to risk-based regulation vs. list-based regulation Methodology: Scenario Analysis & Expert Elicitation Applying TSCA (Toxic Substances Control Act) to Nano-products What scenarios present greatest risks (likelihood & severity) What nanoparticle properties trigger greater level of risk What are the impacts (EHS on susceptible population, ecosystem) What are the significant regulatory gaps? Regulatory Statutes applying to nano-products Case Study: Carbon Nanotubes and the Low Volume Exemption (LVE) Life Cycle Stage: Manufacture Regulatory Gap: Under TSCA, LVE limits regulation of facilities producing <10,000 kg/year Scenario: -About 44 carbon nanotube producers (Cientifica), and about 100 metric tons produced per year (UK Royal Society) -“A 40 inch computer display uses one-sixth of a gram of carbon nanotube powder (roughly 10,000 nanotubes) (Mann 2004). If all 25 metric tons of carbon nanotubes going to electron emission applications (estimated above) are used for computer displays, they would enter into 150 million displays.” Implications: Potential environmental impacts are widespread with no attention to risk. Nanomaterials change the risk assessment paradigm. Mass does not correlate risk or exposure. Case Study: Risk Identification for Air Freshener Sprays Product Information: nm silver nanoparticles in polymer matrix with antibacterial properties (used as spray) High-risk scenarios: Inhalation and air release during use, water entrainment during disposal Nano-property risk triggers: Easy bio-availability, antibacterial property, media-dependent, affect on susceptible populations Intersection Scenarios: Wider bio-availability during air-release or water entrainment Anti-bacterial effects outside product cycle Susceptible Population (respiratory problems) UseInhalation UseAir release UseSkin absorption Disposalwater entrainment Inhalation DisposalAir release Disposal UseIngestion, water entrainment Disposalingestion DisposalSkin absorption Challenges & Opportunities Risk: - Including regulatory and knowledge gaps in framework - Criteria to weigh risks arising from various sources Regulatory:- Statutes regulate products not technologies - Dispersed through multiple agencies Toxicology:- Standardized methods to collect toxicology data for application within risk context Risk versus benefit analysis Hazard communication to decrease exposure Acknowledgement: NSF SES Award # Expected Outcomes: