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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study was performed according to internationally accepted guideline.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
not applicable
Molecular formula:
not applicable
IUPAC Name:
not applicable
Details on test material:
Expanded Graphite Powder

Sampling and analysis

Analytical monitoring:
not specified

Test solutions

Vehicle:
not specified

Test organisms

Test organisms (species):
Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)

Study design

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

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
>= 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
No test substance related inhibition of growth rate and yield was observed up to the highest loading of 100 mg test item/L.
Executive summary:

A study was performed at the Fraunhofer Institute for Molecular Biology and Applied Ecology (IME) to determine the toxicity of the test item Expanded Graphite Powder on the growth of the unicellular fresh water green alga Pseudokirchneriella subcapitata exposed for a test period of 72 hours under static conditions according to OECD 201. The test item was given in sterilised growth medium (100 mg/L loading) to obtain the maximum achievable test item concentration. For the determination of algal growth three replicates for each concentration and eight replicates for controls (test medium only) were exposed to nominal loadings spaced by a factor of

2 (6.25, 12.5, 25.0, 50.0 and 100 mg test item/L). No test substance related inhibition of growth rate and yield was observed up to the highest loading of 100 mg test item/L.

The EC50 was determined to > 100 mg/L and the NOEC value was determined to ≥ 100 mg/L.