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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The study was conducted according to OECD Guideline 121, Estimation of the Adsorption Coefficient (KOC) on Soil and on Sewage Sludge using high performance liquid chromatography (HPLC).
At pH values of 2 and 10, the k’ for phenol, dodecyl-, sulfurized, carbonates, calcium salts, overbased could not be calculated for both the 5.0 and 10 mg L-1 test concentrations. This was because there were no substantial sample peaks observed in any of the chromatograms. It has been demonstrated that the test substance has a chromophore and therefore is assumed to have been retained on the column and has been assigned a log10 KOC value of >5.0.

Key value for chemical safety assessment

Additional information

The key study for this endpoint is considered to have a reliability rating of 1, however the study is being used as read across to a structurally similar substance (Phenol, tetrapropenyl-, sulfurized, carbonates, calcium salts, overbased; CAS No. 122384-87-6/68784-26-9) as there was no available data to fulfil this endpoint for the test material and so the reliability rating will be reduced to 2, according to the criteria of Klimisch, 1997.

The substance is composed of a series of alkylated phenol species of variable composition and a highly refined, lubricant base oil necessary to act as a solvent for the synthetic reaction and to optimize the reaction kinetics used in the substance’s manufacture. Attempts to remove this base oil from the substance result in changes to the other components’ original structures and the physicochemical characteristics of the substance as a whole. With this in mind, the substance is being registered to include the base oil as a component of the substance and thus the base oil is present in the test material.

The substance is one of a series of chemically similar materials each of which is composed of the same highly refined, lubricant base oil and different although closely related series of alkylated phenol species. Although the alkylated phenol series present in the different substances are considered different enough to warrant separate registrations, they are none the less all extremely closely related and the EPIWIN program predicts very similar properties for a number of representative structures. This high degree of similarity, in conjunction with the presence of the same base oil, which is itself understood to have a strong influence on the overall physicochemical properties of the substances is considered sufficient grounds to allow the use of read across between the different members of these “phenate” substances for the studies conducted to examine their physicochemical properties.