Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to microorganisms
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 - 15 May 1991
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
other: BIO-D MIC 286-7
GLP compliance:
no
Vehicle:
not specified
Test organisms (species):
activated sludge
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Duration:
48 h
Dose descriptor:
NOEC
Effect conc.:
25 other: % dilution
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth inhibition
Key result
Duration:
48 h
Dose descriptor:
NOEC
Effect conc.:
98 g/L
Nominal / measured:
nominal
Conc. based on:
act. ingr.
Basis for effect:
growth inhibition
Remarks on result:
other: 25% dilution of product (39.18% concentration) is equivalent to 98 g/l
Duration:
48 h
Dose descriptor:
other: Minimum Inhibitory Concentration
Effect conc.:
50 other: % dilution
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth inhibition

After 48 hours, growth was not inhibited at concentrations up to 25%. No growth was observed in one of the two vessels at 50%, whereas in the other vessel no growth inhibition was observed. Thus the MIC was 50%. No inhition was observed at 25% dilution of the product (NOEC).

Validity criteria fulfilled:
not specified
Conclusions:
The test substance (Diacid 1550 Potassium salt (6339-33), 39.18% concentration) did not inhibit the growth of activated sludge up a 25% dilution of the product. This is recalculated to a concentration for the active of 98 g/L.
Executive summary:

The Minimum Inhibitory Concentration (MIC) was tested according to the method BIO-D MIC 286-7.

After 48 hours contact in water inoculated with sewage microbes, the sample was non-inhibitory to sewage organisms at concentrations of 25% or less.

Description of key information

The test substance (Diacid 1550 Potassium salt (6339-33), 39.18% concentration) did not inhibit the growth of activated sludge up a 25% dilution of the product. This is recalculated to a concentration for the active of 98 g/L.

The Minimum Inhibitory Concentration (MIC) was tested according to the method BIO-D MIC 286-7.

After 48 hours contact in water inoculated with sewage microbes, the sample was non-inhibitory to sewage organisms at concentrations of 25% or less.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
98 g/L

Additional information