Registration Dossier
Registration Dossier
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EC number: 225-625-8 | CAS number: 4979-32-2
Endpoint summary
Administrative data
Description of key information
Additional information
The substance DCBS was investigated in 2 japanese monitoring programs (MITI 1998, MITI 2009/MITI 2010). A sufficiently high number of samples (13 to 29) from surface waters and sediments were taken and analysed with extremely low detection limits (water: 0.3 - 1.1 µg/L, sediment: 0.01 - 0.7 µg/kg). Sampling sites were distributed over Japan in freshwater, estuarine water and marine water regions. Although the substancewas produced and used in rubbers in Japan, no DCBS was found in any of the samples, neither in water nor in sediment.
It was already known by the hydrolysis behaviour that DCBS is not persistent in water due to rapid hydrolysis. The persistency of the substance in sediment has been a matter of discussion. One might assume that the substance is strongly adsorbed to particles due to the high adsorption coefficient and may not undergo further biotic or abiotic degradation. Sediment is considered as a natural sink for strongly adsorbing substances just as they are washed down from roads to the water compartment. Consequently,
some residues in natural sediment should have been detected in the japanese monitoring studies, which however was not the case.
It is therefore concluded that the substance is not persistent in sediment. Additionally, wild-living aquatic organisms (fish, mussels) were investigated by MITI 2010. No residues have been found in these biota up the detection limit of 4.4 µg/kg. This information does not support the substance to be very bioaccumulative (BCF up to 7300, MITI 2005). No relevant sign of accumulation in biota has been observed.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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