Document 6wgw9Rqd8x4qnmwdpNo34aeaE

AR226-3359 EVALUATION OF POTENTIAL ENVIRONMENTAL EXPOSURE FOR PERFLUORINATED 8-2 TELOMER B ALCOHOL ffOUNIVERSITAT ..OSNABRCK J. Klasm eierl. F. Wegmann2 and M. Matthias1 1 1nstitute of Environmental Systems Research, University o f Osnabriick 2 Safety and Environmental Technology Group, Swiss Federal Institute o f Technology, Zurich Introduction Linear chain perffuorinated Tefomer Alcohols are industrial chem icals occurring as interm ediates In tee m anufacture o f various polym eric m aterials containing fluorinated alkyl groups1. Telom er Alcohols are a raw m aterial made from Telom er A and are used to m anufacture polym eric products. The world-wide production of Telom er A has been estim ated to be som e 5,000 tons per year. Values fo r global production, use and environm ental release o f Telom er Alcohols are not yet available.2 in this paper we apply three different m ultim edia models to exem plartty evaluate tee environm ental exposure, overall persistence (Pov) and long range transport potential (LRTP) o f the periluorinated 8-2 Telom er B Alcohol (8 2 TBA). _________ Multimedia Models and Simulation Scenarios ! Sim pleBox4 C haracteristics *- Regional steady-state mass balance model ' P art o f EUSES Scenario(s) Industrial textile application .R egional scale* Germany Continental scale* EU 8-2 TBA Emission One regional company E ight on tee continental level Each em itting 475 kgla Into air | and 25 kg/a Into wastewater O utput ' *Steady-state concentrations Mass dlsfnbution S ensitivity (wrth Crystal Ball) i ELPOS5 , CliMoChem6 jSteady-state mass ba'ance m odel f*. Dynamic box model o f 20 for the evaluation o f Pov and LR TP' latitudinal coupled zones ! Tem perature affects Complete em ission Into air, w ater |Heavily Industrialized zones o r soil, respectively. |(6 and 7) as em ission sources | i - G eneric em ission scenario Independent o f total amount Singular pulse em ission Into air l In each o f tee tw o zones 1 Characteristic travel distance (CTD) Overall persistence (Pov) * Zonal concentration dynamics In air, sea and soli Mass distributions and fluxes Substance data of 8-2 TBA 2 CASNo. molar mass m.p. Vapor pressure water solubility Kaw (calculated) AH*,,(estimated) log Kqw log Kqc (calc, from K ^ ) t^ ln a lr 678-39-7 464.11 42-44C 3 Pa (20C) Q.137 0.053 mg/L / ' 3-6.7 20-40kJ/m ol . . 4 .5 -5 .3 4.0-4.9 . 6 -18 d 7 SimpleBox Results m assfrection regional concentration continental concentration C.V. of regional concentration m ost sensitive param eters Air 55 - 70% 2 0 -3 0 pg/m* W ater <1% 0.5 -1 .0 pg/L 1 5 -2 5 pg/ma 0.3 - 0.7 pg/L 1 0 -1 5 % 1 5-20% t* ln air, advacUvaftow STP param eter, Kqc t ^ w S edim ent <1% 800 - 950 pgfkg 500 - 650 pg/kg 8 0 -9 0 % K qc S o il 3 0 -4 5 % 7 0 -1 0 0 pg/kg 8 0 -1 1 0 pg/kg 90-100 % ELPOS Result Max. LRTP vs. max. Pov fo r 8-2 TBA and a set o f well-known reference chem icals SimpleBox - Sensitivity Analysis To Identify tee m ost sensitive param eters a probabilistic sim ulation Is perform ed by coupling SimpleBox w ith Crystal Ball software3. For this purpose Inform ation about uncertain input param eters is translated Into frequency distributions around the m ost probable value. Substance param eters and Kqc showed highest sensitivity. Except fo r a ir concentration tee Kqc, which Is m eant to describe tee sorption to surface media (soil and sedim ent), proved to be o f high sensitivity. The large coefficients o f variation fo r soil and sedim ent concentration are a direct effect o f tee uncertainty o f tee K ^ .. it Is thus necessary to get a m ore accurate quantitative description fo r tee sorption and volatilization behavior o f 8-2 TBA to get a better baste fo r future m odeling. Respective experim ents have been Initiated w ith a cooperation partner. CliMoChem Results Prelim inary slmulaBons w ith CIIMoCham on Die basis o f available substance data Indlcal a potential fo r transport o f 8-2 TBA to a rctic regions. A ir concentration o f 8-2 TBA one year after pulse em ission In tem perate zones is highest In tee arctic (zone 1). The concentration ratio between a ir and soil decreases by a factor o f about 1.2 from tee em ission zones (tem perate zones 6 and 7) to northern polar zone 2 Indicating a tow potential fo r cold condensation. Tote accum ulated mass In northern zones (1 and 2) Is low due to the high volatility and sm all atm ospheric lifetim e. Discussion Sim ulated steady-state concentrations o f 8-2 TBA fo r a textile application em ission soenario have been calculated w ith SimpleBox. Total substance mass Is estim ated to m ainly reside In a ir com partm ent (55 --70% ). Due to tee model structure em issions Into wastewater lead to accum ulation in sewage sludge and subsequent sludge application to agricultural soil explains tee calculated m ass fraction o f 30 - 45 % In the s o il com partm ent . Long range transport potential o f 8-2 TBA as calculated w ith ELPOS Is Interm ediate compared to some wail known reference chem icals. Prelim inary results from CliMoChem m odel, which are based on available data being currently refined, suggest a potential to r transport to arctic regions, but Indicate a low potential to r cold condensation In these zones. Acknow ledgem ents Oilswikvins CiBrtfeliys o w fcy ite TslwsfD e w itt Pos. References (1j issa E.. FtuorinatedSttfactatts, ScfciokM X Fowkes F.M {ds,)>Mawel DdWfefNewYotK I994> {3{Crystal Sa 2000 Professional V 50. Oecfeioneering Ino, Denv<w{C0). 2000 J4JBrandes L.. den Hoflnder H ,, van de Meenf D,, report na. 719101029,. R1VM, Bitthoven The Netherlands. 1996. Chemtcaia. U fn w e ffu n d e so m tB e rth ta m .liin .^. Schmidt-Verlag,Berlin,2002. . , , ;. 6}chedngerM vWegmanti F , Fenner K, Hungerher K. B n ritan,S ei TochnofM . 1842-1850,2000 |7| BiisAvMarfrn MstewySA t HurleyM5.,:SittliAodereeo M.P,,WaKinfltonT.d,, sw /-m S et tetm eU.S7 (17),3 3B20,2003. , .VM. ' - " ' : ' - ' " '