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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

A study was performed to assess the effect of the test material on the growth of the green alga Pseudokirchneriella subcapitata.

The method followed that described in the OECD TG No 201. Following a preliminary range-finding test, IFF FRET 13 -0156 was exposed to solutions of the test material at nominal concentrations of 1.0, 3.2, 10, 32 and 100 mg/L (three replicate flasks per concentration) for 72 hours, under constant illumination and shaking at a temperature of 24 ± 1 °C.

Analysis of the test preparations at 0 and 72 hours showed measured test concentrations to be near nominal and so the results are based on nominal test concentrations only.

Exposure of Pseudokirchneriella subcapitata to the test item gave the following results based on the nominal test concentrations:

Inhibition of growth rate:

ErC10 (0 - 72 h) :       21 mg/L

ErC50 (0 - 72 h) :       >100 mg/L

NOEC:                       1.0 mg/L

Inhibition of Yield:

EyC10 (0 - 72 h) :       2.9 mg/L

EyC50 (0 - 72 h) :       32 mg/L; 95% confidence limits 25 - 40 mg/L

NOEC: 1.0 mg/L

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
21 mg/L

Additional information