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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Description of key information

Readily biodegradable, but failing 10-day window.

Key value for chemical safety assessment

Additional information

The biodegradability of 3,7 -dimethyloctan-1 -ol was assessed in a 28 days guideline study according to OECD 301 B using activated sludge from a municipal sewage plant. The test substance was found to degrade 70-80 % CO2/ThCO2 after an exposure period of 28 days but failed the 10 -d windows.

In another 29 days guideline study according to OECD 301 F using domestic activated sludge as inoculum the substance was found to be moderately biodegradable because the pass level of 60 % was attained after 29 days instead of 28 days and the 10 -d-window was failed.

In a study conducted with a close structural analogue of the substance (3,7 -dimethyloctan-3 -ol) under same test conditions and according to OECD 301 F as well, it was found to be readily biodegradable (60 - 70% biodegradation after 28 days).

Taking into account all three studies it can be concluded, that 3,7 -dimethyloctan-1 -ol will readily biodegrade in the aquatic environment but fails to meet the 10 -d criteria.