Document jBMzkRm3zQ7jEV110Jy7GyQk

BACK TO MAIN BIOCONCENTRATION (PARTITION COEFFICIENT) TEST SUBSTANCE______________________ Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test substance is a white powder. Sample was recrystalized from a production lot of FC-95, and assigned the internal reference number of TCR-00017-046. Purity was determined to be 97.9% by LC/MS, 1H-HMR, 19F-NMR and elemental analyses techniques. METHOD______________________________________________________ Method/guideline followed: Calculated from n-octanol solubility and water solubility according to OPPTS 830.7550 and OECD 107. Type: n-Octanol/Water partition coefficient (at saturation) GLP (Y/N): Yes Year: 2001 Test Temperature: n-Octanol solubility value at 23 - 24C Water solubility value at 24-25C Remarks: The physical properties of PFOS do not allow determination of the partition coefficient by the shake flask method per guidance provided in the OPPTS and OECD guidelines. Therefore, this study does not bring the two phases (n-octanol and water) into contact with PFOS at the same time, and this testing reflects the partition coefficient for the subject material at saturation only. The n-Octanol / Water partition coefficient was calculated by dividing the solubility of PFOS in n-octanol by the solubility in water and expressing it as the logarithmic value. RESULTS The calculated logKow for PFOS was determined to be -1 .0 8 at saturation (log (56 mg/L in n-octanol / 680 mg/L in water)). CONCLUSIONS No conclusions can be derived from this information. It applies only to a saturated system, which would not likely exist in the environment. BACK TO MAIN Submitter: 3M Company, Environmental Laboratory, P.O. Box 33331, St. Paul, Minnesota, 55133 DATA QUALITY________________________________________________ Reliability: Klimisch ranking 1. Remarks: The solubility studies were conducted properly. However, the applicability of this data point is limited. Application of this value in a risk assessment has limited or no value as it only applies to saturated systems. REFERENCES________________________________________________ Studies conducted at the 3M Company, St. Paul, MN, 2001, Environmental Laboratory Project Number E00-1716. OTHER___________________________________________ Last changed: 6/21/01