Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 205-840-3 | CAS number: 155-04-4
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
According to the guideline ISO 8192 (Test for Inhibition of Oxygen
Consumption by Activated Sludge) a 3h-EC50 of 1220 mg/l was observed for ZMBT (Bayer AG, 1990). For the nitrification inhibition by 2 -mercaptobenzothiazole an EC75 of 3 mg/L during a 2 -4 h incubation period was obtained (Tomlinson et al., 1966). The effect concentration of MBT is lower than the one of ZMBT; and hence it is used as a worst case consideration for the further risk assessment of ZMBT.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 3 mg/L
Additional information
Data from MBT and ZMBT. The key value reported in the study was an EC75 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.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
