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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
27 June to 17 August 2000
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method C.4-E (Determination of the "Ready" Biodegradability - Closed Bottle Test)
Deviations:
no
GLP compliance:
yes
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, adapted
Details on inoculum:
- Source of inoculum/activated sludge: secondary effluent of a domestic sewage treatment plant (Kläranlage Odenthal)
- Concentration of effluents in reaction mixture: 5 ml/l
- Preconditioning: aeration for 4 days
- Treatment given: separation of coarse particles by filtration
Duration of test (contact time):
ca. 28 d
Initial conc.:
2.9 mg/L
Based on:
test mat.
Reference substance:
other: Sodium benzoate
Preliminary study:
No details provided in report
Parameter:
% degradation (DOC removal)
Value:
> 37 - < 39
St. dev.:
1
Sampling time:
7 d
Parameter:
% degradation (DOC removal)
Value:
> 50 - < 55
St. dev.:
2
Sampling time:
14 d
Parameter:
% degradation (DOC removal)
Value:
> 60 - < 64
St. dev.:
2
Sampling time:
21 d
Parameter:
% degradation (DOC removal)
Value:
> 65 - < 66
St. dev.:
0.5
Sampling time:
28 d
Details on results:
Within the test period of 28 days, a degradation of 66% was determined for Ethyl Methylbutyrate-2.

Ethyl Methylbutyrate-2 has to be classified as “Readily Biodegradable’’.
Results with reference substance:
In parallel preparations with the reference substance sodium benzoate a degradation of 78% was achieved within 14 days.
Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
Within the test period of 28 days, a degradation of 66% was determined for Ethyl Methylbutyrate-2.

Ethyl Methylbutyrate-2 has to be classified as “Readily Biodegradable’.
Executive summary:

Within the test period of 28 days, a degradation of 66% was determined for Ethyl Methylbutyrate-2. Ethyl Methylbutyrate-2 has to be classified as “Readily Biodegradable’.

Description of key information

EMB was determined to be biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Within the test period of 28 days, a degradation of 66% was determined for Ethyl Methylbutyrate-2. Ethyl Methylbutyrate-2 may therefore be considered to be ''Readily Biodegradable''.