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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information


Hydrolysis of DEO was examined according to OECD test guideline 111 and GLP.

The preliminary test demonstrated that the test substance rapidly hydrolyses at pH 7 and 9. Only at pH 4 a sufficient recovery was found. Thus, the main test was only performed at pH 4.

The half-life times of hydrolysis of the test substance at 20, 35 and 50°C at buffered solutions of nominal pH 4.0 were estimated (a graphical estimation):

t1/2(20 °C) approx. 1.8 days    t1/2(35 °C) approx. 0.5 day      t1/2(50 °C) approx. 0.2 day

The hydrolysis was considered to be described as pseudo-first order reaction.

Hydrolysis products are monoethyloxalate (initial degradation product), ethanol and oxalate (final degradation product)


Biodegradation in water

In the 28-day study for ready biological degradability (according to OECD test guideline 301D and GLP), the degradation of 67.9 % of the test substance Diethyloxalate was attained at the end of the study, but the 10-day window was failed. The criterion "passing the 10 -day window" does not apply for DEO since the degradation of the substance is characterized by a two-step process: hydrolysis to oxalic acid and ethanol (as demonstrated, e.g. in the hydrolysis study and algae study) and subsequent biological degradation of the hydrolysis products (ethanol and oxalic acid are known to be readily biodegradable).Therefore, it is concluded that DEO is readily biodegradable.