Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

2-ethylhexanol was readily biodegradable in a MITI-I Test, (equivalent to OECD TG 301-C, reliability category 1). This is in line with the observation that the chemical oxygen demand (COD) was reduced by >95%  in the  Zahn-Wellens test (OECD 302B guideline; reliability 2)  within 5 days demonstrating rapid biodegradation. 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Data contained in Japanese government's report (pre-guideline and pre-GLP, however equivalent to OECD 301 C and compliant to a GLP-similar system used then in Japan) demonstrate reliably (RL 1) that 2-ethylhexanol is readily biodegradable in the MITI test I (OECD TG 301 C), as evidenced by complete removal of TOC (100%) and test substance (100%, measured using GC-FID) within 2 weeks. The degradation by BOD (O2 consumption) was reported as 99.9 % and 79.0 % in this study (duplicate samples). The starting chemical concentration was 100 mg/L and concentration of activated sludge was 30 mg/L (NITE, 1977).

In a reliable (with restrictions) supporting study on inherent biodegradability the chemical oxygen demand (COD) of 2 -Ethylhexanol was reduced by >95% (Zahn-Wellens-test, OECD 302B) within 5 days. Kinetic of test substance (in %; Hoechst, 1979):

 Day  % degraded
 1  23
 2  36
 5  96
 7  97
 9  96

Further not assignable (RL 4) studies on inherent biodegradabiltity showing similar results are in support of these data.