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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:
2009-03-31 till 2009-05-27
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
Concentration of inoculum: 30 mg/L sewage sludge
Duration of test (contact time):
28 d
Initial conc.:
100 mg/L
Based on:
test mat.
Details on study design:
Control Experiments:
- Endogenous activity of the inoculum: triplicate
- Reference compound ( 100 mg/L): duplicate
- Toxicity control (test item and reference compound mixed): one
Experiment with test item:
- Test volume : 250 mL
- Test apparatus : OxiTopControl System (WTW)
- Mixing : 1 magnetic stirrer per test vessel
- Incubation time : 28 days
- Incubation temperature : 22 ± 1 °C
-pH: 7.6 - 8.1
Reference substance:
benzoic acid, sodium salt
Remarks:
Purity: 100.1%
Parameter:
% degradation (O2 consumption)
Value:
87
Sampling time:
28 d
Parameter:
COD
Value:
2 g O2/g test mat.
Results with reference substance:
The reference compound sodium benzoate showed 87% degradation after 14 days.
The theoretical oxygen demand of the reference compound is 1.665 mg O2/g reference compound.

Ethane-1,2-diol, propoxylated showed:

3 % degradation after 7 days

58 % degradation after 14 days

79 % degradation after 21 days

87 % degradation after 28 days

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Executive summary:

Within 28 days, a degradation of 87% was determined for Ethane-1,2 -diol, propoxylated; hence Ethane-1,2 -diol, propoxylated is considered to be "Readily Biodegradable" (Currenta, 2009).

Description of key information

Within 28 days, a degradation of 87% was determined for Ethane-1,2 -diol, propoxylated; hence Ethane-1,2 -diol, propoxylated is considered to be "Readily Biodegradable" (Currenta, 2009).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Within 28 days, a degradation of 87% was determined for Ethane-1,2 -diol, propoxylated; hence Ethane-1,2 -diol, propoxylated is considered to be "Readily Biodegradable" (Currenta, 2009).