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Toxicity to aquatic algae and cyanobacteria

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As C14-20 Aliphatics (≤2% aromatic) are poorly soluble in water, most of the studies are performed using Water accommodated fractions (WAFs) and all the results are based on nominal loadings. Thus, the values indicated below as NOECs are actually NOELRs (No observed effect loading rates). No study could lead to the calculation of EL50.

 

Fourteen study reports were available for this end-point, all dealing with the toxicity of the substance Hydrocarbons, C14-C18, n-alkanes, isoalkanes, cyclics, < 2% aromatics on algae growth rate. All the studies used the marine species Skeletonema costatum. None of the studies allowed calculating 48h-EL50 that was never reached. All LL50 are superior to 10000 mg/L based on WAF studies.

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Growth of an alga culture, Pseudokirchnerella subcapitata, as measured by biomass and growth rate, exposed to a 1000 mg/L water accommodated fraction of Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics was not inhibited when compared to the control after a 72-hour exposure. Therefore, the 72-hr EL50 and NOELR values for these two endpoints are reported as >1000 mg/L and 1000 mg/L, respectively.

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