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Toxicity to aquatic algae and cyanobacteria

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A 72-h toxicity study freshwater algae (Selenastrum capricornutum) were exposed to SPS-100. The EC50 for both algal growth inhibition and growth rate reduction exceeded the maximum solubility of the test substance. Therefore, it was concluded that the test substance it is not acutely toxic up to the solubility limit. The present toxicity study is classified as reliable without restrictions according to the OECD guideline No. 201.

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In a 72 h toxicity study, freshwater algae (Selenastrum capricornutum) were exposed to SPS-100 at: 0 (control); 0.1; 1; 10 and 100% of a filtrate (5 µm) prepared at a nominal loading rate of 100 mg/L. The EC50 for both algal growth inhibition and growth rate reduction exceeded the maximum solubility of the substance. Hence, as a consequence of the extremely low solubility of the substance, concentration levels that might be toxic for algae could not be reached. Therefore, it was concluded that the test substance it is not acutely toxic up to the solubility limit. The present toxicity study is classified as reliable without restrictions according to the OECD guideline No. 201.