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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

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012-2013
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
yes (incl. QA statement)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
see study report

Test organisms

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

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
72 h
Post exposure observation period:
28, 51, 72 hours

Test conditions

Test temperature:
The temperture was in the range of 25.3 to 25.7°C. Mean value= 25.4°C
pH:
Ph values increased during the course of the study upon growth of the algea. This increase of pH in the controls was in the required range of ≤ 1.5 units according to the validity criteria given in OECD test guideline 201. The pH of A11 was not determined
Reference substance (positive control):
yes
Remarks:
1.2-Dimethoxyethane

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EL10
Effect conc.:
ca. 0.588 mg/L
Nominal / measured:
nominal
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks:
section by section growth rate
Remarks on result:
other: 0.338-0.838
Duration:
72 h
Dose descriptor:
EL20
Effect conc.:
ca. 1.091 mg/L
Nominal / measured:
nominal
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks:
section by section growth rate
Remarks on result:
other: 0.747-1.411
Duration:
72 h
Dose descriptor:
EL50
Effect conc.:
ca. 3.565 mg/L
Nominal / measured:
nominal
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks:
section by section growth rate
Remarks on result:
other: 2.955-4.411
Duration:
72 h
Dose descriptor:
other: LOEL
Effect conc.:
ca. 1 mg/L
Nominal / measured:
nominal
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks:
section by section growth rate
Duration:
72 h
Dose descriptor:
other: NOEL
Effect conc.:
ca. 0.5 mg/L
Nominal / measured:
nominal
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks:
section by section growth rate

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The validity criteria for the study as given by OECD 201 were met.
Executive summary:

As a conclusion of the analytical part of this study, recoveries of the concentrations determined after 72 hours were all at ≥ 80% of those determined at time t0. The recovery of A-11 within the treatments was sufficient. Based on this, the reported effect concentrations refer to nominal concentrations to be valid.