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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
8 days
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: Documentation/performance of study insufficient according to today standard methods; too long incubation time (8 d); no data on substance stability

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
Unnamed
Year:
1978
Reference Type:
publication
Title:
Unnamed
Year:
1977
Report Date:
1977
Reference Type:
publication
Title:
Unnamed
Year:
1980
Report Date:
1980

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
growth inhibition test over 8 days: Measurement of turbidity: 578, 691 or 436 nm
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No data
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
Not applicable

Sampling and analysis

Analytical monitoring:
no
Details on sampling:
Not applicable

Test solutions

Vehicle:
not specified
Details on test solutions:
No data

Test organisms

Test organisms (species):
Scenedesmus quadricauda
Details on test organisms:
Stock cultures maintained at approximately 27ºC with a relative humidity of 50%.

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
8 d
Post exposure observation period:
Not applicable

Test conditions

Hardness:
Not applicable
Test temperature:
27 °C
pH:
pH 7
Dissolved oxygen:
Not applicable
Salinity:
Not applicable
Nominal and measured concentrations:
Nominal concentrations not reported.
Reference substance (positive control):
not specified

Results and discussion

Effect concentrations
Duration:
8 d
Dose descriptor:
other: toxic threshold concentration, MIC
Effect conc.:
83 mg/L
Nominal / measured:
nominal
Basis for effect:
growth rate
Details on results:
Cell growth inhibition test: The toxic threshold concentration (MIC = minimal inhibitory concentration) is defined as the concentration with incipient decrease in the extinction value (>=3%) at the end of the test period.
Results with reference substance (positive control):
Not applicable

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
An 8 day algal inhibition study was performed in which the algae Scenedesmus quadricauda was exposed to a series of concentrations of butyraldehyde. The 8 day MIC (minimum inhibitory concentration) was determined to be 83 mg/L.
Executive summary:

An 8 day algal inhibition study was performed in which the algae Scenedesmus quadricauda was exposed to a series of concentrations of butyraldehyde. The 8 day MIC (minimum inhibitory concentration) was determined to be 83 mg/L.