Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
other information
Study period:
April 1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: well documented GLP study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1993
Report Date:
1993

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: DIN 38412, L9
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
no

Test solutions

Vehicle:
no

Test organisms

Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h

Results and discussion

Effect concentrations
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 10 g/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The EC50/72h of Tamip monoamid (ZK39.211) to green algae was higher than 10 g/L.
Executive summary:

Algae (Scedesmus subspicatus = Desmodesmus subspicatus) were incubated over a period of 72 h to ZK 39.211 at concentrations from 0.01 -10 g/L. The cell density was determined by extrapolating the measured chlorophyll concentration. Chlorophyll was analysed at 0, 24, 48 and 72 hours by means of a spectrophotometer and values were recalculated for cell density by an calibration factor. Biomass and specific growth rate was calculated.

The cell density was inhibited up to 16% at the highest concentration. Therefore, the EC50/72h was higher than 10 g/L.