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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

In a flow-through toxicity test on rainbow trout a 96-hour LC50 of 0.73 mg/l was obtained for MBT (Monsanto, 1981).

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
0.73 mg/L

Additional information

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.