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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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 chloride and lactic acid.  For calcium chloride, the ErC50 (72 h, Pseudokirchneriella subcapitatat) = is >4000 mg/L (>36.0 M). For lactic acid the ErC50 was 3500 mg/L (38.9 M); the NOEC was 1900 mg/L.The molar ratio to convert from lactic acid by weight to calcium lactate by weight is 1.21 resulting in an estimated ErC50 for sodium lactate of 3500 x 1.21 = 4235 mg/L and NOEC of 1900 x 1.21 = 2300 mg/L.
 

Key value for chemical safety assessment

EC50 for freshwater algae:
4 235 mg/L
EC10 or NOEC for freshwater algae:
2 300 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 chloride and lactic acid.

 

For calcium chloride, there is one study with fresh water algae, Pseudokirchneriella subcapitata (as Selenastrum capricornutum), which was conducted according to OECD guideline 201. The 72-hour EC50 and EC20 obtained on the basis of growth rate from the study were >4000 mg/L (>36.0M) and 2700 mg/L, respectively.

For lactic acid the ErC50 was 3500 mg/L (38.9 M) ; the NOEC was 1900 mg/L. The molar ratio to convert from lactic acid by weight to calcium lactate by weight is 1.21 resulting in an estimated ErC50 for sodium lactate of 3500 x 1.21 = 4235 mg/L and NOEC of 1900 x 1.21 = 2300 mg/L.

 

Calcium lactate is practically nontoxic to algae.

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