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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.

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