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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:
key study
Study period:
2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study according to OECD guideline and GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2005
Report Date:
2005

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Qualifier:
according to
Guideline:
EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic, adapted
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
test mat.
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
5
Sampling time:
28 d
Remarks on result:
other: mean biodegradation
Details on results:
The biochemical oxygen demand (BOD) of the test substance in the test media very slowly increased throughout the exposure period. At the end of the 28-day exposure period, the mean biodegradation of the test item amounted to 5 %. Consequently, the test item was found not biodegradable under the test conditions within 28 days because biodegradation was below 10 %.

Any other information on results incl. tables

The percent biodegradation of the test item was calculated based on the theoretical oxygen demand (ThOD) of 1.88 mg O2/mg test item.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The test item was found not biodegradable under the test conditions within 28 days because biodegradation was below 10 %.
Executive summary:

The test item was investigated for its ready biodegradability in a manometric respirometry test over 28 days according to EU Commission Directive 92/69 EEC, C.4 -D (1992) and OECD Guideline for Testing of Chemicals No. 301 F (1992). The percent biodegradation of the test item was calculated based on the theoretical oxygen demand (ThOD) of 1.88 mg O2/mg test item.

The biochemical oxygen demand (BOD) of the test item in the test media very slowly increased throughout the exposure period. At the end of the 28 -day exposure period, the mean biodegradation of the test substance amounted to 5 %. Consequently, the test item was found not biodegradable under the test conditions within 28 days because biodegradation was below 10 %. No degradation of the test item occurred in the abiotic control under the test conditions within 28 days.