Document LM9RzozLw6rRn2jvo2jLQYk7

AR226 3345Perfluoroalkylated Substances in the Environment : gWhat are they? Where do they come from? Where do they go? F(CF2),, - X ,, / , What do we know about them? 2R. Buck1, F. Hekster2, P. de Voogt 1 DuPontCh a USA, 2 Environmentaland Toxi alChemistry, University o fAt n, Amsterdam, The Netherlands Abstract Psifluotwikylite*ubsteaca (PFAS)an environment! mediaio utbamsedtraiwithsod v oreamsmisrooderaetoiow. Acutetoxicityto to idevarietyofead-uie applies] m whichtakeedvumgeoftbcuniquepropcrliciofthepafluoroalkyl fmoionelity. 1 willbegin fayreviewingthe'i sms"ofPFASendthenproceedto discusshowthesesubstancesareused,theirtot&cs iere available,th ' scofPFAS. ithu becomecleartfutPFAS be tfepFOS) hasbeendetectedgloballyina wide mtyofon tidehavebeatebsetvedforPFAS. PFOShasbeenihovrat mgepi for PFAS. Assuch,areas for futureresearchwill besuggested 19 X Perfluoropoiyethers Solvav-Solexts > Global Telomer A equivalentsproduced in 2000-2002 * approiiiradcly5*&5ML!itoa)$fyr > Regional ProductDbtributton : North America 40% Kutope - 30% > Polymers : 80%o f lots! pre > PreliminaryData Analysts > Coalings > Electronics > Herbicides > Metal Finishing > Oil wells > Polymerisation As a Polymer Water & Oil Repellency Stain & Soil Release 40001ppmon weight of iH |i I! > Leather > Textiles > Carpeting > Coatings Perfluoroalkylated Substances : Where do they go? PFOS has been delected in biota from around the globe PFOS has beat delected in humans around the globe. > Occupationally exposed PFOS: 0.14 - 2.19 ppm PM ) PFQA:0.l -6.8 ppm (3M, DuPatt) > General public PFOS: 17 - 53 ppb (3M, U.S. cnly) PFOA: 3 -1 7 ppb (3M, U S. only) - nctdatectedmlapaD8lL01>of3{fib (0>pw*lfegwiOapoma.42 3ie-Hl30tE) Perfluoroalkylated Substances : What do we know about them? > PFAS subdances arccomplex product mixtures > Partitioning is not solely controlled by hydrophilic and hydrophobic - a-vBletilovspcsFemiireeailhighfcy&QphcMeitymQ'le - campiti c,F,iCit!a tou,c,F^O;\(at1)atlCTr1oit > Adsorption PFOAtbctnolitrcrglyodKnbmdtiespxtMlfci y mwi > Dioconcentration Factor (DCF) PFOS-50,0. TOA " 4. " -UXD Environmental Effects Conclusions & Future Efforts Many data are stiil lacking to complete an accurate environmental assessment - product mixtures complicate the ability to obtain data - predictive models do not have sufficient real data to be useful Industrial companies and consortia are working to develop additional data Global regulatory agencies are interested and actively seeking additional information PFOS is a PBT chemical and is globally distributed Acknowledgements The University o f Amsterdam desk study on PerfluoroalkylatedSubstances in the Netherlands Environment was supported by the Dutch National Institutefo r Coastal & Marine Management, IUKZ. - Hrrte%ncfEeviroRsU]<XnCiBaa(loa&r[ulttJ0gy,122.3COVlRfnn * Thanks to DuPont and The Telomer Research Programfo r providing data regarding Telomer substances.