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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

For MBS a 96-hour LC50 of 0.31 mg/l was determined with a flow-through system with Oncorhynchus mykiss (Monsanto 1981).

Key value for chemical safety assessment

Additional information

Although the fish were fed daily the LC50-value of this key study was considered to be valid since the determination was performed in a flow-through system. The bioavailability was given due to the concentrations were analytically confirmed.

A hydrolysis half-life time of MBS of ca. 24 h was observed in deionised and environmental water buffered at pH 7.0. Benzothiazole-2-thiole (MBT) and benzothoazole (BT) as hydrolysis products are considered here to support the assessment of MBS. The observed effects are most probably a combined effect of the parent substance and the hydrolysis products.