Registration Dossier
Registration Dossier
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EC number: 288-752-8 | CAS number: 85895-78-9
Endpoint summary
Administrative data
Description of key information
Potassium lactate fully dissociates into K+ ions and lactate. The ecotoxicology of potassium-S-lactate can be understood in terms of the ecotoxicology of potassium chloride and lactic acid/lactate.
In short-term toxicity tests on lactic acid in three different fish species mortality was observed resulting in estimated LC50 values ranging between 130 and > 320 mg/L (nominal) which can be attributed to a pH effect. Lactate as such is considered not to exert any systemic effects on fish in the tested concentration range of up to 560 mg/L.
Furthermore, in several short-term toxicity tests of lactic acid in water fleas, immobilisation was observed resulting in estimated EC50 values ranging between 130 and 750 mg/L (nominal) which can again be attributed to a pH effect. Lactate as such is considered not to exert any systemic effects on daphnids in the tested concentration range of up to 750 mg/L.
Lactic acid is practically non-toxic to algae, with an ErC50 of 3500 mg/L and a NOEC of 1900 mg/L (nominal). The mean measured NOErC was identified at 533 mg/L.
Potassium contributes to aquatic toxicity with LC/EC50 values of 880 mg/L (fish), 660 mg/L (Daphnia), and 1337 mg/L (algae). Recalculated to potassium-S-lactate (stoichiometric factor 3.278), the EC50 values would be far in excess of 1000 mg/L. Potassium-S-lactate can therefore be considered as non-hazardous to aquatic organisms.
Furthermore, neither lactic acid nor potassium are inhibitory to respiration of activated sludge. Therefore, no hazard is identified for sewage treatment plants.
Additional information
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