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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).

Key value for chemical safety assessment

EC50 for freshwater algae:
0.5 mg/L
EC10 or NOEC for freshwater algae:
0.066 mg/L

Additional information

Data from MBT.

Data from MBT.

ZMBT is an organic complex with where the relation of Zn to Sulfur bridge is considered to be ionic.

Meanwhile MBT is often found as impurity in ZMBT with variable percentage. The dissolution of MBT determines the hazard profile of ZMBT aqueous solution; and hence a read-across approach from MBT is used to support the risk assessment of ZMBT as a worst-case. No valid data with ZMBT as test substance are available for the acute fish toxicity.

The read-across is justified as ZMBT has an ionic structure where MBT is contained. No valid data with ZMBT as test substance are available for the aquatic algal toxicity.