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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Two aquatic toxicity studies were carried out on NaDMH: Short term toxicty to Daphnia and Toxicity to microorganisms.

The NaDMH study carried out on Daphnia gave a 48 hour EC50 of greater than 100 mg/L. Correspondingly the No Observed Effect Concentration was 100 mg/L. The effect of NaDMH on the respiration of activated sewage sludge gave a 3-hour EC50 of 2200 mg/L. The NOEC after 3 hours exposure was 320 mg/L.

The remaining aquatic toxicity studies were conducted on the analogue chemical DMH.

A study is available which was performed with rainbow trout according to EPA Guideline 72-1. DMH was tested at a nominal concentration of 1000 mg/L . The measured concentration of DMH was 972.2 mg/L. No mortalities occurred. The LC50 was therefore determined to be > 972.2 mg/L.

As previously stated all but two of these studies have been performed on DMH (Dimethyl Hydantoin) and have been used for read-across purposes. A summary of data for read-across of NaDMH with DMH is given in Section 13.