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Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1994

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
Deviations:
yes
Principles of method if other than guideline:
Ratio DOC / activated sludge dry weight at about 1 / 5.
20% difference in the amount of inoculum.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Octylamine
EC Number:
203-916-0
EC Name:
Octylamine
Cas Number:
111-86-4
Molecular formula:
C8H19N
IUPAC Name:
octan-1-amine

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Details on inoculum:
origin: mixed inoculum of sewage treatment plants and Hoechst and Kelsterbach, 1: 2
Type of inoculum: Centrifuged sediment from activated sludge was washed, centrifuged again, and resuspended.
Use centrifuged wet sludge: 12 g/l
accordingly: 1000 mg / l dry weight
pretreatment: none
Duration of test (contact time):
31 d
Initial test substance concentration
Initial conc.:
200 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
DOC removal
Reference substance
Reference substance:
diethylene glycol
Remarks:
DOC=200mg/l; Biodegradation (14d)>70%

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
14.7
Sampling time:
22 d
Parameter:
% degradation (DOC removal)
Value:
65.7
Sampling time:
26 d
Parameter:
% degradation (DOC removal)
Value:
81.7
Sampling time:
31 d
Details on results:
adaption phase: 21d
<10% biodegradation within 20d
>80% biodegradation within 28d

Adsorption: 7.5% all biodegradation values are corrected.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
inherently biodegradable
Conclusions:
Octylamine was found to be inherently biodegradable in a OECD302B test.
Executive summary:

Octylamine was found to be inherently biodegradable in a OECD302B test.

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