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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Two studies were performed to determine the ready biodegradablilty of 1,1-Dimethylurea.

The first was a Manometric Respirometry Test according to OECD 301F over a period of 28 days.The percentage biodegradation of test substance in duplicates were 0.46 % and -2.11 % (mean -0.83 %) on day 14, and 25.78 % and 34.15 % (mean 29.97 %) at the end of the test (on Day 28). The percentage biodegradation of the toxicity control and the procedure control were 40.14 % and 94.61 % respectively on day 14, and 81.65 % and 96.29 % respectively on day 28. The mean percentage biodegradation of the test substance 1,1 -dimethylurea was 29.97 % on day 28 under the current test condition.

A second study was performed in compliance with the OECD Guidelines for the Testing of Chemicals No. 301B " CO2 Evolution Test "(1992).The results showed that the cumulative percentage biodegradation of 1,1-dimethylurea within 28 days was 91.64%.The cumulative percentage biodegradation of the reference item (aniline) in activated sludge after 28 days was 87.81 %.

Additional information