Registration Dossier
Registration Dossier
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EC number: 404-310-0 | CAS number: 10591-85-2 PERKACIT TBZTD; PERKACIT TBZTD PDR; PERKACIT TBZTD PDR-D; TBZD
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
The hydrolysis study does not need to be conducted because the substance is highly insoluble in water
Biodegradation
TbzTD is not readily biodegradable according to a study following the EU method C.5 (2% biodegradation after 28d). Lack of ready biodegradation does not mean that TBzTD is recalcitrant in nature. Firstly, the water insolubility and secondly the stringency of the test procedures could account for the recalcitrance of TBzTD in the Sturm test. No appropriate half-life data are available for drawing conclusions as to its P / vP properties.
According to column 2 of annexes IX and X of REACH regulation EC 1907/2006, further biotic degradation testing shall be proposed by the registrant if the chemical safety assessment according to annex I indicates the need to investigate further the degradation of the substance and its degradation products. First, according to the PBT/vPvB assessment, the substance is not considered PBT/vPvB since it is demonstrated that the substance is not B/vB (log Kow < 4.5 & BCFk =131 < 2000 L/kg) nor T. Second, according to the risk assessment, the risks are considered all acceptable (all RCR are below 1 in all exposure scenarii). Therefore, the CSA does not indicate the need to investigate further hazard and risks. Simulation testings are waived in compliance with column 2 of annexes IX and X of REACh regulation EC 1907/2006
Bioaccumulation
According to a partition coefficient study following EU method A.8 and GLP , the log Kow = 3.7. Moreover, a bioaccumulation study (TG OECD 305 and GLP) investigated the bioconcentration factor of TBzTD in carp exposed to two different concentrations for a period of 28 days in a flow through system followed by a depuration phase of 28 days. The BCFk value of TBzTD at the lowest concentration of 0.5 µg/L is BCFk = 131 and is well below the threshold value of 2000 L/kg according REACH Annex XIII. Therefore the substance is considered not bioaccumulable (not B, not vB).
Transport and distribution
The adsorption/desorption potential of TBzTD was determined according to an OECD 121 testing. Based on the results, the log Koc of TBzTD is 4.6.
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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