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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:
other information
Study period:
1980
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: no glp, no guideline, reproducible data

Data source

Reference
Reference Type:
publication
Title:
Comparison of the toxicity thresholds of water pollutants to bacteria, algae, and protozoa in the cell multiplication inhibition test
Author:
Bringmann, G. and Kuhn, R.
Year:
1980
Bibliographic source:
Water Res. 14:231-241.

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Filled culture tubes were maintained at 27 °C and
relative humidity of 50%. The concentration of the algal
suspension is measured turbidmetrically (while diffused
light is screened off) and expressed by the extinction of
the primary light of the monochromatic radiation at 578
nm for a layer of 10 mm thickness.

Toxicity threshold is defined as the pollutant
concentration resulting in a mean extinction value that is
³ 3% below the mean of the extinction value for the nontoxic
dilutions of the test culture.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
not specified

Test solutions

Vehicle:
no

Test organisms

Test organisms (species):
Scenedesmus quadricauda

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
8 d

Results and discussion

Effect concentrations
Duration:
8 d
Dose descriptor:
other: TT ( toxicity threshold ) = LOAEL
Effect conc.:
4 000 mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
test mat.
Basis for effect:
growth rate

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
TT ( toxicity threshold ) = 4,000 mg/L (LOAEL)