Registration Dossier
Registration Dossier
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EC number: 931-584-3 | CAS number: 66071-92-9
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
- The partition coefficients (log Pow) of the major methanol soluble components of Black liquor are <2.7. Substances with partition coefficients (log POW) >3.2 were not detected, but Black liquor is known to contain different chemical classes such as resins etc. with partiotion coefficients higher than the reported value. Therefore the method is of limited reliability for a UVCB substance such as Black liquor.
- Column 2 of Annex VII (7.8) states that the study on partition coefficient does not need to be conducted if the substance is inorganic or if the test cannot be performed (e.g. no pure substance is available).
- Given the numerous organic and inorganic constituents in Black liquor, any assay used to estimate the partitioning properties would yield a range of values reflecting this complex mixture. In addition, there is no analytical method to do this test in a catch-all way.
Key value for chemical safety assessment
Additional information
The partition coefficients were estimated by an adapted HPLC-method, using only the methanol soluble parts. The partition coefficients (log Pow) of the major methanol soluble components of Black liquor are <2.7. Substances with partition coefficients (log Pow) >3.2 were not detected, but Black liquor is known to contain different chemical classes such as resins etc. with partition coefficients higher than the described values. Therefore the results of the experimental determination of the partition coefficients of Black liquor are of limited reliability.
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