Document 4v8Vq1834VYDMbyJxRKD2g50Q

BACK TO MAIN ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE________________________ Identity: Potassium Decafluoro(pentafluoroethyl)cyclohexanesulfonate may also be referred to as FC-98. (CAS # 67584-42-3) Remarks: The 3M production lot number was 337. The test sample is FC-98. Its purity was not sufficiently characterized, though current information indicates it is a mixture of 66-70% test substance, 18-22% potassium decafluoro(trifluoromethyl)cyclohexanesulfonate, 9-13% potassium nonafluorodi(trifluoromethyl)cyclohexanesulfonate, 1-3% potassium perfluorocyclohexanesulfonate, and a trace of residual organic fluorochemicals. METHOD__________________________________________________ Method: Acute Toxicity of a Compound to Activated Sludge (3M Env. Lab internal method). Test type: Static acute GLP: No Year Completed: 1980 Analytical monitoring: Dissolved oxygen. Statistical methods: Results were determined by graphic interpolation of the change in dissolved oxygen as a function of time. Test organism source: Mixed liquor from Metro Wastewater Treatment Plant, St Paul, MN Test condition: Dilution water: Not noted. Inoculation: Not noted. Reference and test solution preparation: A stock solution was prepared by dissolving 0.6 g of test substance in 1 L of deionized water. Test vessels: Not noted. Number of concentrations: 1 plus blank, in duplicate. Temperature: Not noted. Total suspended solids and pH on day of testing: Not noted. Element Basis: Change in dissolved oxygen compared to the blank. BACK TO MAIN RESULTS Nominal concentrations: Blank control, and test substance at 100 mg/L. Oxygen Uptake Rates (mg 02/L/min): Blank Control 1 = 1.52 (from Time 1-min to time 4-min) Blank Control 2 = 1.52 (from Time 1-min to time 4-min) Test Sample 1 = 1.53 (from Time 1-min to time 4-min) Test Sample 2 = 1.57 (from Time 1-min to time 4-min)* *This sample was aerated in a small beaker for approximately 5-minutes prior to running. No apparent differences between oxygen uptake rates in blank controls and FC-98 exposure concentration of 100 mg/L Element Value: 5-Min EC50 > 100 mg/L Element value based on nominal concentrations CONCLUSIONS_________________________ FC-98 is apparently not inhibitory to activated sludge respiration after 5minutes of exposure at 100 mg/L. Submitter: 3M Company, Environmental Laboratory, P.O. Box 33331, St. Paul, Minnesota, 55133 DATA QUALITY____________________________________________ Reliability: Klimisch ranking = 3. Study lacks description and records of the method followed. The inoculum was not properly characterized. There is a lack of characterization of the test sample purity and the study lacks analytical confirmation of the amount of fluorochemical proportion in the test . REFERENCES_______________________________________________ This study was conducted by the 3M Company, Environmental Laboratory, St. Paul, MN, Lab Request number 5428, 1980. OTHER___________________________________________ Last changed: 3/31/01