Document pejjMqmMKKdJz1yN5gVpXB4GD

BACK TO MAIN STABILITY IN WATER (PHOTOLYSIS) TEST SUBSTANCE_______________ Identity: Remarks: N-ethylperfluorooctane sulfonamidoethanol; may also be referred to as N-EtFOSE alcohol. (1-Octanesulfonamide, N-ethyl-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-N-(2hydroxyethyl)-, CAS # 1691-99-2). N-EtFOSE alcohol is a white powder originally from 3M production lot number 30107. It was HPLC purified and assigned 3M standard identification # SE-035. METHOD Method: Based on OPPTS: 835.5270 and OECD Draft Document "Phototransformation of Chemicals in Water - Direct and Indirect Photolysis", August, 2000. GLP (Y/N): No, but many GLP procedures followed. Year completed: 2001 Type: Direct and Indirect Photolysis Light source: Suntest CPS+ or Suntest XLS+ lamp Light intensity: 680 w/m2 Wavelength range: 290-800 nm Duration: 69.5 to 72 hours Test matrices: Direct: Water Indirect: H9O?/water (1:1 molar equivalent) Soil/dilute aqueous CaCL solution (0.7 g/5mL) (3 soil types - loam, clay loam, sandy clay loam) Soil/dilute aqueous CaCl2 solution with H9O9 FeoOywater (Fe3+ at 24X molar excess) Fe2O?/water with H2O2 Commercial (Aldrich) humic material prepared as in OPPTS 835.5270 Each of the above direct and indirect test matrices included a series of unexposed controls (kept in the dark) for the evaluation of any degradation reactions occurring without the presence of light. Temperature: 253oC Test sample preparation: Aliquots of N-EtFOSE alcohol were added to three separate sets of VOA screw cap vials (exposed, unexposed, and control vials) containing 5 ml of appropriate matrix. Test vials were placed in the photoreactor. Control vials were wrapped in aluminum foil, sealed in a plastic bag, and placed in the photoreacter. Analytical Procedures: A UV/Vis spectrum of a saturated aqueous solution of PFOS was recorded between 190 and 110 nm. Samples were analyzed by quantitative LC/MS and GC/MS techniques. RESULTS Degradation and breakdown products: Degradation of W-EtFOSE alcohol was observed in each matrix, but the observed rates and product distribution varied from matrix to matrix. The three primary degradation products observed were PFOA, W-EtFOSA, and FOSA; however, under certain conditions, 1 BACK TO MAIN trace levels (near the quantitation limits) of other potential degradation products (heptadecafluorooctanes and PFOS) were also observed. It remains unclear whether these compounds were produced by the degradation of W-EtFOSE alcohol; it is also possible that they are degradation products of low-level impurities in the original sample material. Using the iron oxide/H2O2 data, the half-life of W-EtFOSE alcohol was estimated to be 40 days. However, the actual indirect photolytic half-life in the environment could be higher or lower than this estimate by an order of magnitude or more. CONCLUSIONS Using the iron oxide/H2O2 data, the half-life of W-EtFOSE alcohol was estimated to be 40 days. However, the actual indirect photolytic half-life in the environment could be higher or lower than this estimate by an order of magnitude or more. The three primary degradation products observed were PFOA, W-EtFOSA, and FOSA. This study does not provide conclusive evidence of direct photolysis of W-EtFOSE alcohol in this or any of the three other matrices considered. Submitter: 3M Company, Environmental Laboratory, P.O. Box 33331, St. Paul, Minnesota, 55133 DATA QUALITY Reliability: Remarks: Klimisch ranking: 2 Study was well conducted, though not under GLP. REFERENCES This study was conducted at the 3M Environmental Laboratory under Lab Request Number W2783. See 3M Environmental Laboratory Report No. W2783 (dated April 19, 2001). OTHER Last Changed: June 22, 2001 2