Registration Dossier
Registration Dossier
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Benzenesulfonic acid, mono- and dialkylation products with C16-20 (even numbered, branched and linear) olefins, calcium salts, calcium carbonate, overbased, including distillates (petroleum), hydrotreated, solvent-refined, solvent-dewaxed, or catalytic dewaxed, light or heavy paraffinic C15-C50
EC number: 701-356-6 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Introduction
No determination was possible according to Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, due to the following reason:
The HPLC method was carried out. However, the test item was noted to elute just after the dead-time of the column. This finding was out-of-agreement with the estimated log10adsorption coefficient, as well as knowledge that the calcium alkyl benzene sulphonates were extremely soluble in mineral oil but relatively insoluble in water. Therefore, it was concluded that the HPLC method was not appropriate.
Method
Therefore, the adsorption coefficient was estimated using thecomputer-based specialist estimation software, KOCWIN, version 2.00 (February 2009), © 2000-2008 U.S. Environmental Protection Agency. No organo-calcium reference substances were found with known adsorption coefficients; therefore, it was not possible to validate the software.
Results
Using the software, the adsorption coefficient (log10 Koc) has been estimated to be10.0 (MCI method) and 9.8 (Kow method).
Conclusion
Using a computer-based atom fragment contribution method, KOCWIN, version 2.00 (February 2009), © 2000-2008 U.S. Environmental Protection Agency, the adsorption coefficient (log10 Koc) has been estimated to be 10.0 (MCI method) and 9.8 (Kow method).
Key value for chemical safety assessment
Additional information
Introduction.
No determination was possible according to Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, due to the following reason: The HPLC method was carried out. However, the test item was noted to elute just after the dead-time of the column. This finding was out-of-agreement with the estimated log10adsorption coefficient, as well as knowledge that the calcium alkyl benzene sulphonates were extremely soluble in mineral oil but relatively insoluble in water. Therefore, it was concluded that the HPLC method was not appropriate.
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