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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
Not supplied
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Summary of proprietary guideline study
Cross-referenceopen allclose all
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1985
Report Date:
1985

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
Principles of method if other than guideline:
Not relevant
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No further details
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
Not relevant

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
No further details
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
test mat.
Details on study design:
No details supplied

Results and discussion

Preliminary study:
No details supplied
Test performance:
No details supplied
% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
26.8
Sampling time:
10 d
Parameter:
% degradation (O2 consumption)
Value:
32.3
Sampling time:
14 d
Parameter:
% degradation (O2 consumption)
Value:
77.1
Sampling time:
28 d
Details on results:
Biodegradation based on oxygen consumption was calculated to be 0% (2 days), 0% (4 days), 0% (6 days), 5.1% (8 days), 26.8% (10 days), 29.7% (12 days), 32.3% (14 days), 57.3% (16 days), 66.1% (18 days), 68.8% (20 days), 70.7% (22 days), 73.9% (24 days), 75.8% (26 days) and 77.1% (28 days). 100% degradation of the reference substance was seen within 16 days.

BOD5 / COD results

Results with reference substance:
No details supplied

Any other information on results incl. tables

77.1% biodegradation of the test substance was seen within 28 days under the conditions of this study.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
77.1% biodegradation of the test substance was seen within 28 days under the conditions of this study. Tributylphosphate is therefore considered to be readily biodegradable.
Executive summary:

The biodegradation of the susbstance was assessed in a modified MITI test. 77.1% biodegradation of the test substance was seen within 28 days under the conditions of this study. Tributylphosphate is therefore considered to be readily biodegradable.