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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:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 221 (Lemna sp. Growth Inhibition Test)
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Haematoxylin
EC Number:
208-237-3
EC Name:
Haematoxylin
Cas Number:
517-28-2
Molecular formula:
C16H14O6
IUPAC Name:
haematoxylin
Specific details on test material used for the study:
Hematoxylin / purity of 95 %

Test organisms

Details on test organisms:
Strain: Lemna minor

Study design

Water media type:
freshwater
Total exposure duration:
7 d

Test conditions

Test temperature:
23°C +/- 2°C
pH:
stabilised

Results and discussion

Effect concentrations
Duration:
7 d
Dose descriptor:
IC50
Effect conc.:
>= 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
cell number

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
Concentration causing 50% inhibition of organisms growth (number) after 7 days: > 100 mg/L
Concentration causing 50% inhibition of organisms growth (surface) after 7 days: >= 100 mg/L

No Observed Effect Concentration (NOEC): < 100 mg/L

Inhibition of organisms growth (number) at 100 mg/L: <10%
Inhibition of organisms growth (surface) at 100 mg/L: <10%
Executive summary:

Concentration causing 50% inhibition of organisms growth (number) after 7 days: > 100 mg/L

Concentration causing 50% inhibition of organisms growth (surface) after 7 days: >= 100 mg/L