Silver Nanoparticle and Ecotoxicology Research Some Uncertainties

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Presentation transcript:

Silver Nanoparticle and Ecotoxicology Research Some Uncertainties Mila Tejamaya, PhD Lecturer at Occupational Health and Safety Department Faculty of Public Health University of Indonesia

Why AgNPs are interesting? AgNPs are the most rapidly growing classes of nanoproducts AgNPs has been commercialized, so that the exposure to human and environment is expected silver in nanosize shows unique optical, electrical, magnetic and therapetic properties most of AgNPs applications in range of product are applied to bestow antimicrobial properties The most common material mentioned in the product descriptions is now silver (383 products). Titanium (179), which includes titanium dioxide, has surpassed Carbon (87), which includes fullerenes, followed by silica (52), zinc (including zinc oxide) (36), and gold (19). http://www.nanotechproject.org/cpi/site/assets/files/3551/chart_5.png

RISK = HAZARD EXPOSURE X HAZARD DRIVEN APPROACH: Indication of AgNPs (eco)toxicity : Algae Bacteria Daphnia magna Zebrafish Fish Human (Fabrega 2011) EXPOSURE DRIVEN APPROACH: AgNPs release from: Textile Paints Washing machine Waste water treatment etc

Complex behavior of AgNPs as source of uncertainties Homo-aggregation Hetero-aggregation Dissolution Shape transformation Other transformation NPs Stability Test (Levard, Hotze et al. 2012)

Stability Study: Citrate capped AgNPs Colour changes of citrate-coated AgNPs in different media immediately after media addition (left); after 24 hours (right)

Stability Study: PVP capped AgNPs

References: Fabrega, J., R. Zhang, et al. (2011). "Impact of silver nanoparticles on natural marine biofilm bacteria." Chemosphere 85(6): 961-966. Hassellöv, M., J. Readman, et al. (2008). "Nanoparticle analysis and characterization methodologies in environmental risk assessment of engineered nanoparticles." Ecotoxicology 17(5): 344-361. Handy, R., F. Kammer, et al. (2008). "The ecotoxicology and chemistry of manufactured nanoparticles." Ecotoxicology 17(4): 287-314. Handy, R., R. Owen, et al. (2008). "The ecotoxicology of nanoparticles and nanomaterials: current status, knowledge gaps, challenges, and future needs." Ecotoxicology 17(5): 315-325. Hansen, S. F., B. H. Larsen, et al. (2007). "Categorization framework to aid hazard identification of nanomaterials." Nanotoxicology 1(3): 243-U369. Hassellöv, M. and R. Kaegi (2009). Analysis and characterization of manufactured nanoparticles in aquatic environments. Environmental and Human Health Impacts of Nanotechnology. J. R. Lead and E. Smith, John Wiley & Sons, Inc.: United Kingdom. Kaegi, R., B. Sinnet, et al. (2010). "Release of silver nanoparticles from outdoor facades." Env. Pollut. 158(9): 2900-2905 Klaine, S. J., P. J. J. Alvarez, et al. (2008). "Nanomaterials in the environment: behavior, fate, bioavailability and effects." Environmental Toxicology and Chemistry 27(9): 27. Levard, C. m., E. M. Hotze, et al. (2012). "Environmental transformations of silver nanoparticles: impact on stability and toxicity." Environmental Science & Technology 46(13): 6900-6914. Nowack, B. and T. D. Bucheli (2007). "Occurrence, behavior and effects of nanoparticles in the environment." Env. Pollution 150(1): 5-22.

Thank you for your kind attention Mila Tejamaya tejamaya@ui.ac.id mila.tejamaya@gmail.com Department of Occupational Health and Safety C Building 1st floor Faculty of Public Health University of Indonesia Depok, West Java 16424 Phone: +62-21-78849033 Mobile: +62-811-18-10100 Fax: +62-21-7863487