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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

One key study in accordance with GLP and OECD 201 "Freshwater Alga and Cyanobacteria, Growth Inhibition Test". 

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
83 mg/L
EC10, LC10 or NOEC for freshwater algae:
25 mg/L

Additional information

A study was performed to assess the effect of the test item on the growth of the green algaPseudokirchneriella subcapitata. The method followed was designed to be compatible with the OECD Guidelines for Testing of Chemicals (2006) No 201, "Freshwater Alga and Cyanobacteria, Growth Inhibition Test" referenced as Method C.3 of Commission Regulation (EC) No 761/2009.

 

Exposure ofPseudokirchneriella subcapitatato the test item gave the following results:

 

Response Variable

EC50

(mg/L)

95% Confidence Limits

(mg/L)

No Observed

Effect

Concentration

(NOEC) (mg/L)

Lowest Observed Effect Concentration (LOEC) (mg/L)

Growth Rate

83

 

*

 

25

50

Yield

42

37

-

46

25

50

 

Analysis of the test preparations at 0 and 72 hours showed measured test concentrations to range from 94% to 103% of nominal and so the results are based on nominal test concentrations only.

 

*It was not possible to calculate 95% confidence limits for the ErC50value as the data generated did not fit the models available for the calculation of confidence limits.