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Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Endpoint:
activated sludge nitrification inhibition testing
Type of information:
experimental study
Adequacy of study:
key study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2003
Report date:
2003

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
ISO 9509 (Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms)
Deviations:
no

Test material

Constituent 1

Test organisms

Test organisms (species):
activated sludge

Study design

Test type:
static
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
240 min

Test conditions

Reference substance (positive control):
no

Results and discussion

Effect concentrationsopen allclose all
Key result
Duration:
240 min
Dose descriptor:
EC50
Effect conc.:
0.6 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of nitrification rate
Remarks on result:
other:
Key result
Duration:
240 min
Dose descriptor:
EC50
Effect conc.:
0.438 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of nitrification rate
Remarks on result:
other:

Applicant's summary and conclusion

Validity criteria fulfilled:
yes