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Environmental fate & pathways

Adsorption / desorption

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Description of key information

No reliable data are available on TEA-Esterquat caused by the intrinsic properties the registration substance.
Data from a structurally closely related material are available (DODMAC).

Key value for chemical safety assessment

Additional information

No reliable data are available on adsorption for TEA-Esterquats caused by the intrinsic properties of the registration substance.

According to REACH regulation (Annex XI, 1.5), the study on adsorption does not need to be conducted for the substance under investigation if data from a structurally closely related material are available (DODMAC).

The soil sorption of partially unsaturated TEA-Esterquat was investigated in a study conducted according to OECD Guideline 121 and EU-Method C.19. A concrete soil sorption coefficient could not be determined as the test item was not eluted from the column. In the guideline, however, it is stated that the method may not work for surface active substances and the results confirm this. Therefore this study is not appropriate to determine the soil sorption coefficient.

The TEA-Esterquats represent a mixture containing mono-, di-, and triester of triethanolamine with C16-C18 saturated, and C18 unsaturated fatty acids. Therefore the calculation of the soil sorption coefficient Koc TEA-Esterquat themselves is not feasible. To get a hint on the Koc of the components, calculations for the mono-, di- and triester for the C16 and C18 saturated and C18 unsaturated (unsaturated: 1 double bond, located in the middle of the fatty acid) were conducted using EPIWIN v3.20, PCKOCWIN v1.66. The results indicate a strong (monoester; log Koc=3 -3.53) to very strong (di-, triester; log Koc=7.67 -15.25) binding to soil organic matter. The sulfuric acid methylester shows a very low potential for geoaccumulation. However, the calculation model is not suitable for surface active ionic substances and therefore should not be applied to the ionic TEA-Esterquat.

Furthermore it is not opportune to determine a Koc from log Pow because the common Koc derivations are not valid for surface active substances (EU RAR 2009, see also REACH Reference guidance 7a, section R7.1.15).