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UID:20250809T142628EDT-6641fErsJW@132.216.98.100
DTSTAMP:20250809T182628Z
DESCRIPTION:Everyone is welcome to attend this CIVE 615 Environmental Engin
 eering Seminar (part of the Environmental & Water resource engineering sem
 inar series) given by Dr. Geoffrey I. Sunahara\, Group Leader\, Applied Ec
 otoxicology\, National Research Council Canada.\nTraditionally\, toxicity 
 is associated with the concentration or the mass-based “dose-metric” expos
 ure to the chemical of concern. Dose-metrics are important in establishing
  a “cause-effect” relationship\, which is used in environmental risk asses
 sment to predict potential hazardous effects of environmental exposure at 
 contaminated sites. Examples will be presented on how ecotoxicity data is 
 generated and used for traditional environmental risk assessment. However\
 , the current standard toxicity test guidelines and ecotoxicological risk 
 assessment methods may not be sufficient to address the ecotoxicological c
 oncerns of engineered nanomaterials (ENM) that are being released into the
  environment. There is much uncertainty amongst nano-ecotoxicologists and 
 environmental risk assessors regarding the choice and use of the dose-metr
 ic of ENM whose toxicity is determined by concentration\, as well as the n
 ano-size of the chemical. The possible adverse effects of exposure to ENM 
 in the environment have attracted the concern of industry\, government reg
 ulators\, as well as the general public. For example\, what are the impact
 s of the release of ENM used in sunscreen lotions and cosmetics on the env
 ironment? Recent laboratory studies have shown that exposure to commercial
  uncoated nano-TiO2 particles can cause toxic effects in some aquatic and 
 terrestrial organisms. This presentation will include some of our recent f
 indings describing nano-ecotoxicological responses using dose-metric analy
 sis of a widely-used model nano-toxicant such as nano-TiO2\, but whether t
 his or other engineered nano-contaminants have toxic effects in the enviro
 nment is not known.\nGeoffrey Sunahara has more than 25 years of experienc
 e in environmental and biochemical toxicology. He has published >80 resear
 ch articles in well-respected journals and >200 conference proceedings and
  book chapters. In 1994\, Dr. Sunahara established and was made responsibl
 e for the Applied Ecotoxicology group at the National Research Council of 
 Canada. Fields of research include the ecotoxicological characterization o
 f recalcitrant soil contaminants such as the energetic substances (TNT\, R
 DX and HMX) and their metabolites using whole organisms and cultured cell 
 approaches. Toxicological information generated by his laboratory is being
  used in the establishment of soil quality criteria for explosives-contami
 nated sites used by the Canadian land forces\, as well as those of other c
 ountries. Recent research interests include the ecotoxicology of nano-mate
 rials\, biodiesel and selected bioproducts. In his ecotoxicity studies\, a
  major focus is made upon innovation\, ecological relevance\, risk assessm
 ent\, and modes of toxicity. These achievements have led to international 
 recognition\, as evidenced by the prestigious international 2010 TTCP Scie
 ntific Achievement Award. Dr. Sunahara has also collaborated with other ex
 perts to assemble and recently publish a comprehensive book on the Ecotoxi
 cology of Explosives (CRC Press).\n
DTSTART:20131011T140000Z
DTEND:20131011T152500Z
LOCATION:Room 1050\, Wong Building\, CA\, QC\, Montreal\, H3A 0C5\, 3610 ru
 e University
SUMMARY:The ecotoxicological problem of 'Dose': from explosives to little b
 its
URL:/channels/event/ecotoxicological-problem-dose-expl
 osives-little-bits-230787
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