Fatty acids, C16-18, lead salts

Toxicity to aquatic algae and cyanobacteria

Description of key information

For algae, 17 individual reliable freshwater acute toxicity data points for three species (Pseudokirchneriella subcapitata, Chlorella kesslerii, Chlamydomonas 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 kesslerii, Chlamydomonas 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).