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EC number: 235-252-2
CAS number: 12141-20-7
For algae, 17 individual reliable freshwater acute toxicity data
points for three species 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). Acute toxicity values
for the freshwater alga Chlorella kesslerii (48 h EC50
of 388 µg dissolved Pb/L) and Chlamydomonas reinhardtii (48
h EC50 of 171.8 µg dissolved Pb/L).
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 (Pseudokirchneriella
subcapitata). Chronic toxicity values for the freshwater alga Chlorella
kesslerii and Chlamydomonas reinhardtii were 120 µg
dissolved Pb/L (48h NOEC) and 82.3 µg dissolved Pb/L (48h NOEC),
respectively. High quality 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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