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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The acute toxicity of MBT to aquatic invertebrates (Dapnia magna) was tested according to OECD TG 202 "Daphnia sp. Acute Immobilisation test". After 48 hours of exposure an EC50 of 0.71 mg/L was obtained (MITI, 1999). The described metabolites of MBT are less toxic to aquatic invertebrates than MBT itself.

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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. The effect concentration of SMBT aqueous solution as test substance is higher than the one of MBT. Therefore the effect concentration of MBT is taken as a worst case consideration for the risk assessment of SMBT.