Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
August- October 2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 306 (Biodegradability in Seawater)
Deviations:
yes
Remarks:
nitrite and nitrate concentrations were not measured
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
Test substance: Triazolone
CAS#: 930-33-6
Stability: stable
Solubility: soluble in seawater
Appearance: white solid, powder with no odour
Date received: 01.09.2006
Storage: 20°C
Oxygen conditions:
aerobic
Inoculum or test system:
natural water: marine
Details on inoculum:
NA
Duration of test (contact time):
ca. 28 d
Initial conc.:
ca. 2.04 mg/L
Based on:
ThOD
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
Test substance (2-10 mg per litre) was added directly to the test medium and mixed on a magnetic stirrer, for at least 15 min.

The closed bottles were incubated in the dark at 20.0°C +/- 1.4 for 28 d.

Reference substance:
benzoic acid, sodium salt
Parameter:
% degradation (test mat. analysis)
Value:
ca. 1
Sampling time:
7 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 3
Sampling time:
28 d
Details on results:
The test substance was degraded by 3% after 28 days.
Results with reference substance:
84% of biodegradation after 28 days.

none

Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Conclusions:
A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28d.

Triazolone was degraded by 3% after 28 days. Based on this, the test substance can not be characterised as readily biodegradable in the marine environment according to the OECD guideline 306.
Executive summary:

A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28d.

Triazolone was degraded by 3% after 28 days. Based on this, the test substance can not be characterised as readily biodegradable in the marine environment according to the OECD guideline 306.

Description of key information

A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28days.

Triazolone gave 3% biodegradation after 28 days. Based on this, the test substance cannot be characterised as being readily biodegradable in the marine environment according to the OECD guideline 306.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:
marine water

Additional information