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Published byKathleen Wheeler Modified over 9 years ago
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Environmental Risk Assessment of Engineered Nanomaterials
Katerina Dontsova, Elizabeth Ferguson, Al Kennedy, Jerry Miller, Mo Qasim, Chuck Weiss, Jeffery Steevens Jeffery Steevens (lead) Environmental Laboratory and Geotechnical and Structures Laboratory US Army Engineer Research and Development Center
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Nanomaterials Risk Assessment
Meet environmental sustainability objectives by identifying and quantifying the environmental attributes of nanomaterials. Sources of nanomaterials? Fate and transport mechanisms? Likely exposure scenarios? Biological effects resulting from exposure? Proactively support the development and implementation of nanotechnology. Must include milestones and completion dates per task as given in P2. Format is flexible, can use Excel table or Microsoft Project (example above). Gant Chart format is preferred (tie to P2 activity). Describe the project plan in detail. Use this chart to explain how you will execute the project. Provide an explanation of key project management and scientific activities that you will execute. Discuss key milestones and scheduling of deliverables. A discussion of how you will handle (analyze/evaluate) data is mandatory – i.e., what is your statistical design. Media Primary Pathway Receptor Secondary Material Conceptual model
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Conceptual Model 2. Media and Transport Processes Exposure Pathways
and Receptors 1. Sources Air Terrestrial Vertebrates Inhalation Aggregation/ UV Degradation Contact Ingestion Terrestrial Invertebrates Engineered Nanostructures Engineered Nanodevices Reaction Intermediates Production Waste Product Degradation Settling / suspension Contact Ingestion Soil Degradation Contact, Ingestion Contact Ingestion Ingestion Sorption / desorption Aquatic Invertebrates Ingestion Water Contact Ingestion Aggregation/ Degradation Fish Ingestion Fish Contact Ingestion Ingestion Settling / suspension Sediment Benthic Invertebrates Degradation Contact Ingestion Ingestion Product use, Spills Intentional application, disposal
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ERDC Research Efforts 1. Relevant Vectors for Exposure (2 yr):
Focus: Role of functionalization on the availability and toxicity of CNT Unique: 1) CNT Only (PEG, NH3, COOH) 2) Aquatic toxicity 3. Nanomaterial Program (7 yr): Focus: Characterization and classification of nanomaterials Unique: 1) Characterization 2) Goal to establish classification system How to deliver Nanoparticle to microcosm? Via water column Directly to sediment When to deliver nanoparticles? Continuously (hydrostatic pump) Intermittently Once, prior to clam addition (how long to allow for equilibration?) Do nanoparticles partition into sediment (fate)? How does addition of food influence uptake? Do nanoparticles sorb to algae (food)? Does presence of food increase clam’s exposure to nanoparticles? 2. Nanomaterial Structure Affect Biota? (2 yr): Focus: Biological effects of different nanomaterials Unique: 1) CNT, Fullerene, Metal Oxide, Reaction intermediates 2) Measures of bioavailability/Toxicity Shared: 1) Materials (7 total) and cost for synthesis Characterization information
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ERDC Remediation Risk Modeling Sensors Fate Toxicology Sorption
Transport Mechanisms Dose Metrics Stability Analytical Modeling
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