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Ecotoxicological information

Long-term toxicity to fish

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Administrative data

Link to relevant study record(s)

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 for MBT (Monsanto, 1989).

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater fish:
0.041 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. 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 chronic fish toxicity.