Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 604-047-3 | CAS number: 137863-20-8
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Apr - June 2013
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)
- Qualifier:
- according to guideline
- Guideline:
- ISO DIS 9439 (Ultimate Aerobic Biodegradability - Method by Analysis of Released Carbon Dioxide)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- GLP compliance:
- yes
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge: activated sludge freshly obtained from a municipal sewage treatment plant: 'Waterschap Aa en Maas', Heeswijk-Dinther, The Netherlands, receiving predominantly domestic sewage
- Duration of test (contact time):
- 28 d
- Initial conc.:
- 17 mg/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Reference substance:
- acetic acid, sodium salt
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 17
- Sampling time:
- 28 d
- Details on results:
- The relative biodegradation values calculated from the measurements performed during the test period revealed 18% and 17% biodegradation of TETRAZOLYL VALAMID, for the duplicate bottles tested. Thus, the criterion for ready biodegradability (at least 60% biodegradation within a 10-day window) was not met.
In the toxicity control more than 25% biodegradation occurred within 14 days (32%, based on ThCO2). Therefore, the test substance was assumed not to inhibit microbial activity. - Results with reference substance:
- Degradation kinetic:
4% after 2 days
31% after 5 days
59% after 9 days
75% after 14 days - Validity criteria fulfilled:
- yes
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- The substance was not readily biodegradable under the conditions of the modified Sturm test presently performed.
Reference
Description of key information
The substance was not readily biodegradable under the conditions of the modified Sturm test presently performed.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
- Type of water:
- freshwater
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
