Registration Dossier
Registration Dossier
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EC number: 269-646-0 | CAS number: 68308-34-9 The complex combination of hydrocarbons obtained by the thermal decomposition (at 399°C (750°F) or higher) of kerogen. It consists of hydrocarbons and heterocyclic compounds containing nitrogen, sulfur or oxygen.
Endpoint summary
Administrative data
Description of key information
Additional information
ENVIRONMENTAL FATE PROPERTIES
Summary of degradation
Abiotic degradation
No data on the hydrolysis of shale oil are available. Based on the properties of the test substance (it is a mixture of various different compounds, not chemically well defined with no main component) a hydrolysis study is technically not feasible.
Biotic degradation
In an inherent biodegradability study to the OECD 302C guideline, at the end of the 28-day exposure period, the mean extent of biodegradation of Shale Oil (middle fraction) was 22%. Thus, some compounds of the test item were biodegradable. However, the major part of the test item was not biodegraded within 28 days of test duration in this inherent biodegradability test.
On the basis of the results of the study for the purpose of the risk assessment it has been concluded that Shale Oil (middle fraction) is: inherently biodegradable, not fulfilling specific criteria.
Volatilisation
No data available.
Distribution modelling
No distribution modelling data exist.
Summary of environmental distribution
Data are not available to allow the distribution of Shale Oil (middle fraction) within the environment to be modelled. In Section 1.3 the solubility of Shale Oil (middle fraction) is reported as 220 mg/L, the Log Pow as 3.11 - 8.20 and the vapour pressure as 64.6 Pa at 25°C. Based on these properties the substance would be expected to be primarily distributed between air and water with moderate association with soils/sediments.
Summary and discussion of bioaccumulation
Aquatic bioaccumulation
Shale oils are complex mixtures of various different compounds which are not chemically well defined with no main component. Therefore, the performance of a bioaccumulation study is not possible. Although the Log Kow of the substance is >3 it is susceptible to biodegradation and thus the risk of bioaccumulation is low. The BCF in fish calculated by EUSES 2.1 using the LogKow of 3.4 is 155, which further indicates a low risk of bioaccumulation. The available data are adequate for classification and labelling purposes and PBT assessment, so no further testing is required. Also direct and indirect exposure of the aquatic compartment is unlikely.
Terrestrial bioaccumulation
No data are available on terrestrial bioaccumulation. However, the bioaccumulation potential of the substance is predicted to be low. The risk of terrestrial bioaccumulation is therefore negligible
Secondary poisoning
Shale Oils (middle fraction) present a low risk with regard to secondary poisoning due its low bioaccumulation potential
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