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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

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

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2005

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

Constituent 1
Chemical structure
Reference substance name:
Calcium 4-chloro-2-(5-hydroxy-3-methyl-1-(3-sulfonatophenyl)pyrazol-4-ylazo)-5-methylbenzenesulfonate
EC Number:
403-530-4
EC Name:
Calcium 4-chloro-2-(5-hydroxy-3-methyl-1-(3-sulfonatophenyl)pyrazol-4-ylazo)-5-methylbenzenesulfonate
Cas Number:
129423-54-7
Molecular formula:
C17H15ClN4O7S2.Ca
IUPAC Name:
calcium 4-chloro-5-methyl-2-{2-[3-methyl-5-oxo-1-(3-sulfonatophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazen-1-yl}benzene-1-sulfonate

Test organisms

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

Study design

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

Test conditions

Test temperature:
21 - 25 °C
pH:
8.33-9.14
Reference substance (positive control):
yes
Remarks:
Potassium dichromate

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
LOEC
Effect conc.:
> 39.8 mg/L
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
39.8 mg/L
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
LOEC
Effect conc.:
> 39.8 mg/L
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
39.8 mg/L
Basis for effect:
growth rate
Details on results:
Substance did not cause any inhibiting effects to the test species after 72 h when tested with a saturated solution (mean measured 39.8 mg/l).
Results with reference substance (positive control):
EC50 0.29 mg/l inhibition of biomas growth (confidential interval 0,26-0,33)
EC50 0.59 mh/l Rate-related inhibition (confidential interval 0.55-0.63)

Applicant's summary and conclusion