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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

The Maximum Acceptable Toxicant Concentration (MATC) in an early-life stage test on rainbow trout was determined to be 0.041 - 0.078 mg/l within 89 days. The concentration of 0.078 mg/l was reported as LOEC and 0.041 mg/l as NOEC (CMA, 1989).
No experimental data available regarding the chronic toxicity of the described metabolites of MBT to fish, such as BT, BTon, MBTS and MeSBT. According to the acute toxicity of them to fish, they are expected to be less toxic than MBT.

Key value for chemical safety assessment

Additional information

SMBT is an organic salt of strong base NaOH and weak acid of MBT and it is solely marketed as aqueous solution. The presence of MBT determines the hazard profile of SMBT aqueous solution; and hence the read-across approach is used to support the risk assessment of SMBT. No valid data with SMBT as test substance are available for the chronic fish toxicity.