Registration Dossier
Registration Dossier
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EC number: 287-370-9 | CAS number: 85480-89-3
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- migrated information: read-across based on grouping of substances (category approach)
- Adequacy of study:
- weight of evidence
- Study period:
- 1984
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study was conducted according to the appropriate OECD test guideline, and in compliance with GLP.
Data source
Reference
- Reference Type:
- other: Study report
- Title:
- Unnamed
- Year:
- 1 984
- Report date:
- 1984
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
- Deviations:
- no
- GLP compliance:
- yes
Test material
- Reference substance name:
- [ethylenebis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
- EC Number:
- 244-742-5
- EC Name:
- [ethylenebis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
- Cas Number:
- 22036-77-7
- IUPAC Name:
- 22036-77-7
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- Activated sludge from the HRC sewage treatment plant. The nature of the influent to this treatment plant is not known.
The activated sludge was filtered through Whatman No 1 paper (first 200 ml discarded) and the filtrate was kept aerated until used. - Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 40 other: mg C/l
- Based on:
- DOC
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- DOC removal
Reference substance
- Reference substance:
- benzoic acid, sodium salt
Results and discussion
% Degradation
- Parameter:
- % degradation (DOC removal)
- Value:
- 0
- Sampling time:
- 21 d
- Remarks on result:
- other: Data for days 27-28 of the test period were not recorded due to contamination by a broken pipe.
- Details on results:
- Briquest 422-25S attained 0% degradation after 21 days and was not considered readily biodegradable under OECD
Guideline No. 301-E. The control substance attained 85% degradation after 14 days and 97% after 28 days, confirming
suitability of the inoculum and culture conditions.
Degradation products: no
BOD5 / COD results
- Results with reference substance:
- Day 7: 79%
Day 14: 85%
Day 28: 97%
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- under test conditions no biodegradation observed
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