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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The toxicity of MBT to aquatic algae (Selenastrum capricornutum) was tested according to OECD TG 201 "Alga, Growth Inhibition Test". After 72 hours of exposure, an ECr50 of 0.5mg/L and a NOEC of 0.066 mg/L were obtained (MITI, 1999). The described metabolites of MBT are less toxic to aquatic algae 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. No valid data with SMBT as test substance are available for algae and cyanobacteria toxicity.