Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

No measured data on photodegradation/photolysis are available for TEA-Esterquats.

Due to the very low emissions of TEA-Esterquats to air (negligible vapour pressure) the extent of photodegradation in air has no relevance for the environmental fate for this class of chemicals.

TEA-Esterquats are characterized by hydrophobic parts of the moieties “R” linked to the charged head group via ester bonds R-C(O)O-and are therefore expected to be subject to degradation by chemical or biological hydrolysis.

This is supported by the test on hydrolysis for partially unsaturated TEA-Esterquat. Half-lives of 17 (pH 7) and 11.3 d (pH 9) were deduced from the reaction rate constants at 25 °C. Di- and mono-ester were detected as degradation products.

TEA-Esterquats are readily biodegradable, biodegradable under anaerobic conditions and under different environmental conditions (water, sewage treatment plants). Due to the ready biodegradability and the anaerobic biodegradability, biodegradation does not need to be investigated further according to REACH regulation (Annex IX, 9.2.1.4, column II) and column 2 of REACH Regulation Annex IX, 9.2.1.3.

There are no experimental data available from bioaccumulation studies with TEA-Esterquats. There are, however, measured data available for a structurally similar compound (DODMAC). The aquatic BCFs for a similar substance (DODMAC) are 12 l/kg and 13 l/kg . The calculated BCF for the all TEA-Esterquat species is 71 (BCFWIN v2.17).

For DODMAC, the measured sediment accumulation factors for two worm species are 0.28 - 0.78, and the biota-to-soil accumulation factor for 4 different terrestrial plants is in the range of 0.005 - 0.025.The registration substances, TEA-Esterquats, are readily biodegradable and are subject to degradation by hydrolysis. In organisms the substances are de-esterified and further degraded via the fatty-acid metabolic pathway. The aquatic bioaccumulation and the terrestrial bioaccumulation are expected to be of the same order of magnitude as that of DODMAC. The bioaccumulation potential of the registration substance is expected to be low.

 

No reliable data are available for adsorption on TEA-Esterquats caused by the intrinsic properties of the registration substances. 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. Measured sorption coefficients for soils and sediments are available from the structurally very similar substance DODMAC (EU RAR 2009). In the EU Risk Assessment Report of DODMAC, a value of 10,000 l/kg dw was chosen for both Kpsed and Kpsoil.

 

No data are available on volatilisation. Considering the molecular structure, extremely low vapour pressures for the ionic substances are expected. Therefore volatilisation of TEA-Esterquats is negligible.

 

The calculation of the Mackay Level I failed as the log Kow, which is needed as input parameter, cannot be determined due to the surface-active properties of TEA-Esterquats. Based on the available data, it can be assumed that TEA-Esterquats will not volatilise from aqueous solution. According to the results of adsorption/desorption experiments, TEA-Esterquats will mainly be adsorbed by soil and sediments. The distribution to biota is negligible.