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Toxicity to aquatic algae and cyanobacteria

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Description of key information

ErC50 72h Desmodesmus subspicatus  > 1000 mg/l (loading rate), corresponding to > 92 mg/l measured concentration

EyC50 72h Desmodesmus subspicatus  > 1000 mg/l (loading rate), corresponding to > 92 mg/l measured concentration

ErC50 72h Desmodesmus subspicatus  > 100 mg/l has been chosen as representative value since no effect has been observed up to the measured concentration of 92 mg/l.

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L

Additional information

The multi-constituent substance " Reaction mass of dodecane-1-thiol and tridodecyl trithiophosphite" was tested for growth inhibition on algae Desmodesmus subspicatus. The test was performed according to OECD TG 201 and the result was EC50 growth rate 72h Desmodesmus subspicatus  > 1000 mg/l loading rate, corresponding to > 92 mg/l measured concentration. According to ECHA guidance R7b for slightly soluble substance for which no effect at concentration below 100 mg/l was observed, the PNEC should be calculated on limit value of solubility in the medium. For this substance the limit of solubility in the medium is expected to be similar to the solubility of the substance in water (i.e. 96.3 mg/l) approximated to 100 mg/l. ErC50 72h Desmodesmus subspicatus  >100 mg/l has been chosen as representative value since no effect has been observed up to the measured concentration of 92 mg/l.

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