Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Hydrolysis:

Further testing is not required. Based on the data presented in this dossier, substances Hydrocarbons, C14 -C20, aliphatics, 2% aromatics have been shown to be readily biodegradable. According to column 2 of Annex VII on the standard information requirements, hydrolysis studies do not need to be conducted if the substance is readily biodegradable. Moreover, hydrolysis is not expected to be a signifcant mechanism of degradation in the environment because the substances lack hydrolitically reactive functionnal groups. Therefore, it is not subject to hydrolysis and this process will not contribute to the degradative loss from the environment.

Biodegradation:

Based on the biodegradation results from relevant substances within Hydrocarbons, C14-C20, aliphatics (≤2% aromatics) were found to be readily biodegradable (biodegradation > 60% ThOD) in OECD 306 ready biodegradability tests. Taking into account that all those substances have been found biodegradable in the seawater 306 test, lead to the conclusion that all the substances with the same properties and are therefore considered readily biodegradable.

Bioaccumulation:

This endpoint is fulfilled for Heptadecane using quantitative structure property relationships for representative hydrocarbon structures. The BCFBAF 3.01 model is a well characterised and generally accepted bioaccumulation prediction model, used by the USEPA, the OECD and recommended by ECHA. The SMILES input data for the BCFBAF 3.01 model is obtained from the PETRORISK Product Library (see OECD QSAR Toolbox report in 'Attached full study report' and PETRORISK report attached in IUCLID section 13).

The calculated BCF of Heptadecane ranges from 47.79 - 3974.81 L/kg.

The BCFWIN v2.16 model within EPISuite 3.12 has been used to estimate the bioaccumulation potential of a representative substance. This data is used as a weight of evidence alongside the data reported above.

The calculated BCF of icosane is 22 L/kg cacluatedusing the BCFWIN v2.16 model within EPISuite 3.12. This value indicates that icosane is not considered a bioaccumulative substance.

Adsorption / desorption:

This endpoint is characterised for Heptadecane using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK report attached in IUCLID section 13).

Adsorption coefficient has been calculated using Petrorisk. The Koc for Heptadecane ranges from 2.51 x10^5 - 1.38 x10^7.

The following data on other representative substances have been included as a weight of evidence. The data is estimated using the calculation in the Concawe Library of Petrorisk, using SPARC v4.2 program (May 2008).

Koc of the read-across substance icosane has been estimated by calculation in the Concawe Library of Petrorisk, using SPARC v4.2 program (May 2008). The calculated value is 1.84 x 1011L/kg, using a log Kow of 11.46. This result suggests that icosane is expected to be immobile in soil.

Additional information