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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
activated sludge respiration inhibition testing
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test
Deviations:
not specified
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Sodium 4-(2-hydroxynaphth-1-ylazo)-3-methylbenzenesulphonate
EC Number:
227-458-6
EC Name:
Sodium 4-(2-hydroxynaphth-1-ylazo)-3-methylbenzenesulphonate
Cas Number:
5850-86-2
Molecular formula:
C17H14N2O4S.Na
IUPAC Name:
sodium 4-(2-hydroxynaphth-1-ylazo)-3-methylbenzenesulphonate

Test organisms

Test organisms (species):
activated sludge

Study design

Test type:
not specified
Water media type:
not specified
Total exposure duration:
24 h

Test conditions

Test temperature:
25°C
pH:
from 3.3 to 6.8

Results and discussion

Effect concentrations
Duration:
24 h
Dose descriptor:
EC50
Effect conc.:
744 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Remarks:
respiration rate

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
EC50 = 744 mg/l
Executive summary:

Based on the result of the test performed on similar substance 2, the value of EC50 is 744 mg/l.