Document DGqZkMrV3kgYgp0k2XDDeygpn

p. 1 GV NTRAAL INSTITUUT VOOR VOEDiNGSONDERZOE K CENTRAL INS7IME FOR NUTRCflON AND FOOD AESFJIRCN ~csewe= Zest 48 / C~C~~j CC /~ _ . .. . .~ - L 1 ~~ (} 1 . v_~3 ,~ ~ . . , " F -~C;~~ ~~ .. ~ ~~~.. -~~.Y< < . ~~E;.r ; ~ ~ REPORT NO . $78-148 4 '6 DETERMINATION OF POSSIBLE RESIDUES OF MONOMERS AND C8-F2iULSIFIER IN VARIOUS PERPLDOROCAR .BON ~oG POLYMERS Authors At the request of Approved by Analysis No Date Number of copies - : Drs . D . van Battum, M .A .H . Rijk , A . Schouten and A . Ta s : Du Pont de Nemours International SA, Geneva, Switzerland Hoechst AG, Gendorf, German y ICI Ltd, Welwyn Garden City, England : Prof .Ir . B . Kro l : B78-1484 : July 1979 : 10 r o EID112163 4~. P p. 2 . shaken, the absorbance spectrum of the clear supernatant was run between 700 and 600 mm with a reagent blank in the reference cell and the absorbance at 640 nm was determined . From the absorbance at 640 cnn of sample and standard solutions the CS-emulsifier content of the extracts was calculated . - standard solution s A stock solution of CB-emulsifier in distilled water, containing 3 g ammonium perfluorooctanoate per 1, was prepared from which diluted standard solutions were made, containing 9, 15, 45, 60, 90 and 180 ug C8-emulsifier per 100 ml respectively . The solutions thus obtained were further treated as described in section 2 .2 .2 . - detection limits The calibration graph for the determination of C8-emulsifier is depicted in fig . 4 . From this graph it can be deduced that 10 pg C8emulsifier per 100 ml water, corresponding to I mg/kg polymer (1 ppm) for the granular resin samples, can still be detected . 2 .3 Determination of the specific migration of C8-emulsifie r Samples of the skived tapes, unsintered tapes and tubing, having a total surface area of 2 dm2 were cut in strips of 2 .5 x 10 cm . The strips were kept submerged in 100 ml distilled water for 10 d at 40 oC . After the storage period the liquids were decanted, filtered over a coarse glass filter and further treated as described in section 2 .2 .2 . The absorbance at 640 um of the solutions was determined and then the C8-emulsifier content of the solutio-~ : was calculated by means of the calibration graph mentioned in section 2 .2 .2 . From the results thus obtained the specific migration of a mmonium perfluorooctanoate was calculated . 3 . RESULTS The following results were obtained . 3 .1 Monomer conten t EID112164 sample monomer-content (mg/kg) TYE HFP TEFLON 701-N granular resin < 0 .01 TEFLON 701-N skived tape < 0 .01 TEFLON 669-N unsintered tape < 0 .01 - TEFLON 100 FEP granular resin < 0 .01 0 .08 BOSTAFLON IF 1620 granular resin < 0 .01 - HOSTAFLON TF 1620 skived tape < 0 .01 - HOSTAFLON TF 2026 granular resin < 0 .01 - HOSTAFLON TF 2026 tubing < 0 FLUON C 163 granular resin < .01 0 - .01 FLUON G 163 skived tapp e e < 0 .01 FLUON CD I unsintered tape < 0 .01 - - . /7 p. 3 B78-1484 7 3 .2 C8-emulsifier content sample C8-emulsifier content (mg/kg) - TEFLON 701-N granular resin 4 TEFLON 701-N skived tape 3 .1 TEFLON 669-N unsintered tape 23 .5 TEFLON 100 FEP granular resin 1 .5 HOSTAFLON TF 1620 granular resin 1 .5 HOSTAFLON TF 1620 skived tape 0 .2 HOSTAFLON TF 2026 granular resin 94 W STAFLON TF 2026 tubing 0 .4 FI.UON G 163 granular resia 1 .2 FLUON C 163 skived tape 2 .1 FLUON CD I unsintered tape 5 .5 3 .3 'Specific migration of C8-emulsifie r sample Specific migration of C8-emul : (mg/dm2) TEFLON 701-N skived tape < 0 .005 TEFLON 669-N unsintered tape < 0 .005 HO STAFLON TF 1620 skived tape _ 0 .007 HOSTAFLON TF 2026 tubing < 0 .005 FLUON G 163 skived tape < 0 .005 FLUON CD I unsintered tape < 0 .005 CIYO--TNO I O x 7 9-07-23 YdV 0 0 0 EID112165