Registration Dossier
Registration Dossier
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EC number: 920-778-3 | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
MTDID 50908 is a multi-constituent substance. The partition coefficient (Kow) was determined for components identified as A, B, D, F and H. The average measured log Kow for Component A and H is 6.14 (RSD=0.72%), the average measured log Kow for Component B is > 6.49 (RSD=2.01%), the average measured log Kow for Component D is 5.46 (RSD=1.08%), and the average measured log Kow for Component F is > 6.44 (RSD=2.71%). Read across from a category member was used to obtain a log Kow of 5.7 for an impurity.
Key value for chemical safety assessment
Additional information
The n-Octanol/Water Partition Coefficient (log Kow) of MTDID 50908 was determined according to U.S EPA guidance document OPPTS 830.7550 "Partition Coefficient (n-Octanol/Water), Shake Flask Method". Quadruplet test vessels of three different volume ratios (1:1, 1:2, and 2:1) of MTDID 50908 dosed n-octanol to water were prepared. Ratio 1:1 was prepared a second time on a separate day due to octanol phase contamination in the water phase for the first set. The samples were rotated 180 ° about their transverse axis for 100 rotations over a period of five minutes to ensure proper mixing of the test system solvents. The samples were then centrifuged at 1000 RPM for at least 30 minutes to ensure a visibly clear separation of layers, prior to removing n-octanol and the aqueous sample analysis aliquots. The n-octanol aliquot were removed first and diluted with methanol. The water aliquot were removed after the n-octanol aliquot removal and analyzed directly. All samples were analyzed using purge and trap gas chromatography/mass spectrometry (GC/MS).
MTDID 50908 is a multi-constituent substance. The partitioning coefficients were determined based on measured concentrations in n-octanol and water phase for the compounds identified as Component A and H, Component B, Component D, Component F.
This is a guideline study conducted under ISO17025. The log Kow are reported for the primary components listed in the composition and are limit values only. Therefore, it is considered reliable with restriction and a key study. This study is pertinent to the fate of MTDID 50908 and may be used for Risk Assessment, Classification & Labelling, and PBT Analysis.
The log Kow for the impurity was established by readacross from a category member. Please see IUCLID section 13 for the category justification and a matrix of physicochemical and distribution data for members of the Perfluorinated Organic Chemicals C5-C18 category.
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