Document ZJyb9Na0ZOvj1LVe0g7vMRY2L

P-1 `uLD N T R A A L INSTITUUT VOOR YOEDINGSONDERZOEK y tr *chaewej 48 Zelsc CENTRAL INSTITUTE FOR NUTW TION AN D FOOD RESEARCH - 3 8 0 -6 ? l)V lA A tuk 'y:- 5-i^CO < Vu, G j- . REPORT NO. B78-1484 DETERMINATION OP POSSIBLE RESIDUES OF MONOMERS AND C8-EMPLSEFIER IN VARIOOS PERFLPOROCARBON POLTMERS Authors At the request of Approved by Analysis No Date Number of copies Drs. D. van Bat tum, M.A.H. Rijlc, A. Schouten and A. Tas : Du Pont de Nemours International SA, Geneva, Switzerland Hoechst AG, Gendorf, Germany ICI Ltd, Welwyn Garden City, England : Prof.Ir. B. Krol : B78-1484 July 1979 10 LWB000743 EID112163 P-2 shaken, the absorbance spectrum of the clear supernatant vas run between 700 and 600 na with a reagent blank in the reference cell and the ab sorbance at 640 nm was determined. From the absorbance at 640 nm of sample and standard solutions the C8-emulsifier content of the extracts vas calculated. -- standard solutions - A stock solution of C8-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 ng 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 de picted in fig. 4. From this graph it can be deduced that 10 pg C8- emulsifier per 100 ml water, corresponding to 1 mg/kg polymer (l ppm) tor the granular resin samples, can still be detected. 2 *3 Determination of the specific migration of C8-emulsifier 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 C. 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 nm of the solutions was determined and then the -emulsifier content of the solution : was calculated by means of the calibration graph mentioned in section 2.2.2. From the results thus obtained the specific migration of ammonium perfluorooctanoate was calculated. 3. RESULTS The following results were obtained. 3.1 Monomer content sample TEFLON 70I-N granular resin TEFLON 701-N skived tape TEFLON 669-N unsintered tape TEFLON 100 FEP granular resin HOSTAFLON TF 1620 granular resin HOSTAFLON TF 1620 skived tape HOSTAFLON TF 2026 granular resin HOSTAFLON TF 2026 tubing FLUON C 163 granular resin FLU0N G 163 skived tape FLUON CD 1 unsintered tape EID I12164 monomer content (mg/kg) TFE HFP < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 - 0.08 - - - - - - - LWB000744 B78-U84 p.3 7- 3.2 C8-eaulsifier content sample TEFLON 701-N granular resin TEFLON 701-N skived Cape TEFLON 669-N unsintered tape TEFLON 100 FEP granular resin HOSTAFLON TF 1620 granular resin HOSTAFLON TF 1620 skived tape HOSTAFLON TF 2026 granular resin HOSTAFLON TF 2026 tubing FLOON G 163 granular resin FLOON G 163 skived tape FLOON CD 1 unsintered tape C8-emulsifier content (mg/kg) 4 3.1 23.5 1.5 1.5 0.2 94 021...124 5.5 . ' 3.3 Specific migration of C8-emulsifier ' sample Specific migration of C8-emul (mg/dm2) . TEFLON 701-N skived tape TEFLON 669-N unsintered tape HOSTAFLON TF 1620 skived Cape HOSTAFLON TF 2026 tubing FLOON G 163 skived cape FLOON CD 1 unsintered tape ' < 0.005 < 0.005 0.007 <0.005 < 0.005 < 0.005 LWB000745 CI70-TNQ 1Cbc 79-07-23/YdV EID112165