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:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: well documented study, but no data concerning GLP compliance. screening test.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2004

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: flakes

Sampling and analysis

Analytical monitoring:
no

Test solutions

Vehicle:
yes
Details on test solutions:
the test item is dissolved in LC resconstituted water, that means prepared using deionized water with a conductivity less than 1µS/cm.

Test organisms

Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
Details on test organisms:
strain n° CCAP 276/20. (rapidly growing unicellular species)

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
72 h

Test conditions

Hardness:
no data
Test temperature:
between 23.6 and 24.1 °C.
pH:
between 7.43 and 7.71 à T=0h.
between 8.48 and 9 at T=72h.
Dissolved oxygen:
no data
Nominal and measured concentrations:
nominal concentrations : 1, 10 and 100 mg/L.

Results and discussion

Effect concentrations
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
dissolved
Details on results:
the higher concentration without observed effect on algal growth at 72h is >= 100 mg/L, based on growth rate and biomass.

Applicant's summary and conclusion