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Ecotoxicological information

Toxicity to microorganisms

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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:
comparable to guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report Date:
1999

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
not specified

Test organisms

Test organisms (species):
activated sludge of a predominantly domestic sewage

Study design

Test type:
static
Water media type:
freshwater
Total exposure duration:
3 h

Test conditions

Test temperature:
21 °C
pH:
7.4

Results and discussion

Effect concentrations
Key result
Duration:
3 h
Dose descriptor:
EC0
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: respiration rate

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
Degrades rapidly, with the visible formation of titanium oxide as a precipitate within minutes of adding to water.
The recorded degradation products are titanium dioxide, propan-2-ol, triisopropanolamine, diethyleneglycol and propylene glycol. The organic products are known to biodegrade readily.
These organic products are known to biodegrade readily with very high BOD and no indication of toxicity to microbial systems