Registration Dossier

Administrative data

Endpoint:
activated sludge respiration inhibition testing
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline Study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998
Report Date:
1988

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
ISO 8192 (Water quality - Test for inhibition of oxygen consumption by activated sludge for carbonaceous and ammonium oxidation)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Tridecanol N (Isotridecanol)
- Analytical purity: not reported

Sampling and analysis

Analytical monitoring:
no

Test organisms

Test organisms (species):
activated sludge, domestic
Details on inoculum:
- Laboratory culture: activated sludge from a municipal sewage treatment plant (Lambsheim, Germany)
- Initial biomass concentration: 1 g/L

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
30 min

Test conditions

Details on test conditions:
Total test volume: 250 ml containing 260 mg test substance (1040 mg/L, TOC = 811 mg/g, 50 ml inoculum (5 g/L), 8 ml medium

Results and discussion

Effect concentrationsopen allclose all
Duration:
30 min
Dose descriptor:
other: EC20
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Remarks:
respiration rate
Duration:
30 min
Dose descriptor:
EC50
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Remarks:
respiration rate
Duration:
30 min
Dose descriptor:
other: EC80
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
inhibition of total respiration
Remarks:
respiration rate

Any other information on results incl. tables

No inhibition of respiration was observed after incubation of 1040 mg/l  for 30 min, at the concentration of 1040 mg/l.

Applicant's summary and conclusion