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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Non-GLP study conducted according to national standard test guidelines
Qualifier:
according to
Guideline:
other: German standard DIN 38412 Part 9
GLP compliance:
no
Analytical monitoring:
no
Vehicle:
not specified
Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
Details on test organisms:
TEST ORGANISM
- Strain: SAG 86.61
- Source (laboratory, culture collection): Algensammlung Goettingen
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h
Test temperature:
24.8 °C
pH:
7.84 - 8.13
Nominal and measured concentrations:
Nominal: control, 25, 50, 100, 250, 500 mg/L
Reference substance (positive control):
not specified
Duration:
72 h
Dose descriptor:
EC10
Effect conc.:
22.2 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 500 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate

Based on the determined fluorescence values growth rate and yield were recalculated.

Treatment [mg/L]

Growth rate inhibition [%]

Yield Decrease [%]

Control

0

0

25

6.7

17.8

50

13.6

36.3

100

32.0

64.8

250

21.9

52.4

500

34.6

66.7

Concentration

[mg/L]

pH values

0 h

96 h

Control

7.84

7.92

25

7.87

7.99

50

7.89

8.04

100

7.86

8.07

250

7.89

8.12

500

7.88

8.13

Validity criteria fulfilled:
yes
Conclusions:
After an exposure time of 72 h following effect values were observed: EC10 = 22.2 mg/; EC50 > 500 mg/L.
Executive summary:

Possible toxic effects of the test substance towards algae were investigated in a study which followed German standard DIN 38412 (Part 9). After an exposure time of 72 h following effect values were observed: EC10 = 22.2 mg/; EC50 > 500 mg/L.

Description of key information

Possible toxic effects of the test substance towards algae were investigated in a study which followed German standard DIN 38412 (Part 9). After an exposure time of 72 h following effect values were observed: EC10 = 22.2 mg/L; EC50 > 500 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
500 mg/L

Additional information

Possible toxic effects of the test substance towards algae were investigated in a study which followed German standard DIN 38412 (Part 9). After an exposure time of 72 h following effect values were observed: EC10 = 22.2 mg/L; EC50 > 500 mg/L.