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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Calcium lactate fully dissociates into Ca2+ ions and lactate. The ecotoxicology of calcium lactate can be understood in terms of the ecotoxicology of calcium ions and lactic acid. Calcium ions are known as an essential nutrient for microorganisms; they are non-toxic.  No inhibition of activated sludge respiration was observed for 100 mg lactic acid 88.3%/L.  The molar ratio to convert from lactic acid by weight to calcium lactate by weight is 1.21.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
107 mg/L

Additional information

Calcium lactate fully dissociates into Ca2+ ions and lactate. The ecotoxicology of calcium lactate can be understood in terms of the ecotoxicology of calcium ions and lactic acid. Calcium ions are known as an essential nutrient for microorganisms; they are non-toxic. 

Lactic acid 88.3% does not inhibit activated sludge respiration at concentrations up to 100 mg/L test material (88.3 mg/L active substance). Inhibition was -1.1% (stimulation). Note that lactic acid is produced by certain micro-organisms in sewage treatment plants, and removed by other micro-organisms in the same 'ecosystem'. As such lactic acid is an ubiquitous and abundant natural component of active sewage treatment systems. No toxic effects of lactic acid on STPs is expected.

The NOEC respriation inhibition for calcium lactate can be calculated from the NOEC for lactic acid: 88.3 x 1.21 = 107 mg calcium lactate/L. Note that the NOEC for lactic acid, and thus also the NOEC for calcium lactate, is expected to be much higher because lactic acid is produced by certain micro-organisms in sewage treatment plants, and removed by other micro-organisms in the same 'ecosystem'.

No toxic effects of calcium lactate on STPs is expected.