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EC number: 205-840-3 | CAS number: 155-04-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Following the OECD Guideline 301C (MITI Test (I)) a degradation of 2.5% within 14 days was observed. Therefore 2-mercaptobenzothiazole is classified as not readily biodegradable (MITI 1992). On the other hand the inherent biodegradability of MBT was tested with acclimated bacterial inoculum andonly 2% biodegradation of MBT was observed during 35 days of exposure (Monsanto, 1979); and hence MBT can be concluded as not inherently biodegradable. In the EU-Risk Assessment for CBS (CAS: 95-33-0), information regarding the biodegradability of the main metabolites of MBT, such as MBTS, BT, BTon, and MeSBT, is also summarized and discussed. The described metabolites are also not readily biodegradable. Only when the inoculi were adapted under special conditions, certain level of degradation of BT, BTon, and MeSBT was observed. Such processes are expected in biological treatment plant, but not in the environment.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
ZMBT is an organic complex with where the relation of Zn to Sulfur bridge is considered to be ionic.
The dissolution of MBT determines the hazard profile of ZMBT aqueous solution; and hence the environmental fate and behavior of MBT is used as read-across approach to support the risk assessment of ZMBT. The read-across is justified as ZMBT has an ionic structure where MBT is contained.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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