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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Reference
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April 1989
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to
Guideline:
EU Method C.2 (Acute Toxicity for Daphnia)
Deviations:
no
GLP compliance:
no
Test organisms (species):
Daphnia magna
Details on test organisms:
Age: 2 to 24 h;
Hardness:
total harness = 2.60 mmol/L
Test temperature:
292 - 294 °K = 18.85 - 20.85 °C
pH:
pH = 8
Nominal and measured concentrations:
Concentrations tested: 500; 250; 125; 62.5; 31.25 mg/L.
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
176.78 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC0
Effect conc.:
125 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC100
Effect conc.:
250 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mobility
Validity criteria fulfilled:
yes
Conclusions:
Under the study conditions, toxicity of the test substance in Daphnia sp. Acute Immobilisation Test was determined to be 48h-EC50: 176.78 mg/L.
Executive summary:

A study was conducted to determine toxicity of the test substance towards Daphnia magna according to EU Method C.2. The study was performed using 5 nominal concentrations ranging from 500 to 31.25 mg/L. For each test concentration, 20 Daphnia were exposed to the test substance for 48 hours in a static test system. After 48 hours, immobilised Daphnia were counted. No analytical dose verification was conducted. Under the study conditions, the nominal 48 h EC50 of the test substance fo rDaphnia was 176.78 mg/L (Bias, 1989).

Description of key information

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
176.78 mg/L

Additional information

A study was conducted to determine toxicity of the test substance towards Daphnia magna according to EU Method C.2. The study was performed using 5 nominal concentrations ranging from 500 to 31.25 mg/L. For each test concentration, 20 Daphnia were exposed to the test substance for 48 hours in a static test system. After 48 hours, immobilised Daphnia were counted. No analytical dose verification was conducted. Under the study conditions, the nominal 48 h EC50 of the test substance for Daphnia was 176.78 mg/L (Bias, 1989).