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EC number: 205-736-8 | CAS number: 149-30-4
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
Additional information
The available data on MBT biodegradation reveal that under standard conditions the substance is not mineralized, therefore MBT could be classified as not biodegradable. Mineralization occurs only when the inoculi are adapted. Such adaptation processes may occur e.g. in industrial or municipal biological treatment plants. It can be concluded from the degradation tests as well as from the available monitoring data that MBT removal in treatment plants can be considerable but not complete. In addition to MBT, releases of the products of primary transformation are expected.
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