Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 201-077-5 | CAS number: 78-04-6
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Persistence:
Dibutyltin maleate is classified as not readily biodegradable. Although no hydrolysis study is available, in aqueous environments it is known to undergo hydrolysis to DBT oxide. DBT oxide is itself known to be stable to hydrolysis.
It is therefore concluded that DBT maleate does not satisfy the persistence criteria, but that the hydrolysis product DBT oxide does.
Bioaccumulation:
No bioaccumulation data are available for dibutyltin maleate, it is not possible to determine the LogKow experimentally and available QSARs are not appropriate for organometallic compounds. However, it is possible to read across from data on the similar compound dibutyltin chloride. In aquatic bioaccumulation studies dibutyltin chloride had BCFs of 5 to 135. These are significantly below 2000 and thus dibutyltin chloride and by read across, dibutyltin maleate, can be considered not to satisfy the bioaccumulation criterion.
Toxicity:
No chronic data are available. All the acute endpoints (EC/LC50s) are >0.1 mg/L. The NOEC obtained in the algal study was 0.88 mg/L (also considered a long term end point). Based on the environmental data dibutyltin maleate is not considered to satisfy the T criteria.
However, dibutyltin maleate is classified as a category 2 mutagen and as category 1B for toxicity for reproduction. Dibutyltin maleate is therefore considered to satisfy the T criteria.
PBT/vPvB outcome:
Dibutyltin maleate is classified T.
Dibutyltin maleate is not classified as P or B or vPvB.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
