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Toxicity to aquatic algae and cyanobacteria

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For algae, 17 individual reliable freshwater acute toxicity data points for three species (Pseudokirchneriella subcapitata, Chlorella kessleriiChlamydomonas reinhardtii) were put forward for hazard assessment purposes.



  • The acute toxicity values (72h-EC50) for Pseudokirchneriella subcapitata varied between 20.5 µg dissolved Pb/L (at pH 7.6 and hardness of 24 mg/L as CaCO3) and 364 µg dissolved Pb/L (at pH 6 and hardness of 24 mg/L as CaCO3).

  • The acute toxicity value for the freshwater alga Chlorella kesslerii (48 h EC50) was 388 µg dissolved Pb/L, and

  • The acute toxicity value for the freshwater alga Chlamydomonas reinhardtii (48 h EC50) was 171.8 µg dissolved Pb/L.


 


For algae, 16 individual reliable freshwater chronic toxicity data points for three species (Pseudokirchneriella subcapitata, Chlorella kessleriiChlamydomonas reinhardtii) were put forward for hazard assessment purposes.



  • Chronic high quality no-effect levels for freshwater algae were situated between 6.1 µg dissolved Pb/L and 190.0 µg dissolved Pb/L (both datapoints for Pseudokirchneriella subcapitata).

  • The chronic toxicity value for the freshwater alga Chlorella kesslerii was 120 µg dissolved Pb/L (48h NOEC).

  • The chronic toxicity value for the freshwater alga Chlamydomonas reinhardtii was 82.3 µg dissolved Pb/L (48h NOEC).


 


High quality chronic no-effect levels for marine algae were available for three different species (Skeletonema costatum, Dunaliella tertiolecta, and Phaeodactylum tricornutum) and were situated between 29.4 µg dissolved Pb/L (Skeletonema costatum; endpoint: yield) and 1234 µg dissolved Pb/L (Phaeodactylum tricornutum; endpoint: growth rate).

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