Registration Dossier
Registration Dossier
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EC number: 273-265-5 | CAS number: 68955-28-2 A complex combination of hydrocarbons produced by the distillation of products from a thermal cracking process. It consists of hydrocarbons having a carbon number predominantly of C4.
Endpoint summary
Administrative data
Description of key information
The members of this category are gases at standard temperature and pressure and will predominantly partition to the atmosphere. Consequently, conducting a standard biodegradability test on thses streams is considered technically not feasible, and based on exposure estimates the test is not relevant.
The use of QSAR to predict the biodegradability of representative constituents of these streams is an appropriate technique and it is more appropriate to consider the biodegradability of representative constituents of these streams.
The representative constituents of the category studied and used as supporting read-across are But-1-en-3-yne (CAS 689-97-4), But-1-ene (CAS 106-98-9), But-2-ene, cis- (CAS 590-18-1), But-2-ene, trans- (CAS 624-64-6), Buta-1,2-diene (CAS 590-19-2), Buta-1,3-diene (CAS 106-99-0), Butane (CAS 106-97-8), Prop-1-ene, 2-methyl- (CAS 115-11-7), Propane, 2-methyl- (CAS 75-28-5).
The predictions of ready biodegradability of representative constituents of this category have been predicted using the EPISUITE v4.11 BIOWIN models (2017), which use methodology described by Howard et al. (1992), Boethling et al. (1994) and Tunkel et al. (2000). Results from predictions using BIOWIN showed the constituents except But-1-en-3-yne, Buta-1,2-diene and Buta-1,3-diene to be readily biodegradable. But-1-en-3-yne, Buta-1,2-diene and Buta-1,3-diene, although not readily biodegradable, was shown to biodegrade rapidly. Therefore, streams within this Category are expected to degrade rapidly. Based on the available data, it is considered that this Category would be classed as readily biodegradable.
The half-lives of representative constituents of this category have been predicted using the EPISUITE v4.11 BioHCwin model (2017), which uses methodology described by Howard et al. (2005). Results from all predictions using BioHCwin showed the constituents to have rapid half-lives in water of between 1.92 and 3.46 days.
The biodegration study in soil does not need to be conducted because the substance is readily biodegradable (the study scientifically not necessary).
Additional information
Studies on biodegradation in sediment, surface water and soil have not been done because the substances in the Category are classified as readily biodegradable. In addition, as the substances are gasses at room temperature, sediment and soil are most likely not compartments of concern.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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