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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

In this study, Hordaphos CC MIS was found not to inhibit the growth of the freshwater green alga Pseudokirchneriella subcapitata after 72 hours when tested with 100 mg/L and a pH adjusted to 8.1. The NOEC (0-72 h) for both inhibition of growth and inhibition of yield was 100 mg/L.

As the toxic effects are due to the pH value this was additionally investigated in a geometrical series of five test concentrations. Under these conditions, the following effect values were determined: The EC50-values with 95 % confidence intervals for inhibition of growth rate (ErC50) and yield (EyC50) after 72 hours were 35.3 (32.8 – 44.3) mg/L and 20.9 (19.3 – 22.6) mg/L, respectively. The NOEC-values for inhibition of both growth rate and yield after 72 hours were < 10.0 mg/L. All effect values are based on the nominal concentrations of Hordaphos CC MIS.

Key value for chemical safety assessment

Additional information