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Ethyl-(S)-lactate has an atmospheric half-life of 2.6 days due to OH radical attack.

Hydrolysis does not need to be investigated since ethyl lactate is assessed to be readily biodegradable.


Ethyl-(S)-lactate is assessed as readily biodegradable. Further degradation tests (in surface water, sediment, or soil) do not need to be conducted.


Based on (bio)degradability, aqueous solubility and log Kow, ethyl-(S)-lactate will not bioconcentrate.

Transport and distribution:

Adsorption/desorption: In accordance with column 2 of REACH Annexes XIII and IX, points 9.3.1 and 9.3.3, an adsorption/desorption study does not need to be conducted if, based on the physicochemical properties, the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol-water partition coefficient).The log partition coefficient of the test substance was predicted to be 0.31. Therefore, the test substance is considered to have low potential for absorption and no further testing is required.

Henry's Law constant: Simple calculation of vapour pressure divided by aqueous solubility gives a Henry's Law constant of 0.26 Pa m³/mol for ethyl-(S)-lactate.

Distribution modelling: Ethyl-(S)-lactate will be mainly be distributed to air (92 %).

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