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Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to aquatic algae.

Key value for chemical safety assessment

Additional information

In analogy to the NTA acid the aquatic toxicity to algae was investigated with the salt Na3NTA.

The inhibitory effect of NTA was determined in a 72 hour static test with the green algae Scenedesmus subspicatus [BASF AG, 1999]. Based on growth rate the 72-hour EC50 was > 100 mg/L.

The NOEC derived from the results was 1.56 mg/L (equivalent to 1.16 mg/L NTA acid). This was considered as not biological relevant as the effects observed in the next three higher dose rates were below 10 %. Thus the EC10 of 22.8 mg/L were taken into account as lowest endpoint where no effect was determined.