Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2000
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2000
Report Date:
2000

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Polyamide
- batch no.2108/9

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, industrial (adaptation not specified)
Details on inoculum:
derived from the secondary effluent of Lamberti's tratment plant. The volume used was filtered and added to the test medium.
Duration of test (contact time):
28 d
Reference substance
Reference substance:
other: Phathalic dipotassium salt

Results and discussion

% Degradation
Parameter:
% degradation (O2 consumption)
Value:
ca. 2.7
Sampling time:
28 d
Details on results:
The dissolved oxygen concentration were determined electrochemically using an oxygen electrode.
BOD was than calculated by subtracting the oxygen depletion of the test substance from the oxygen depletion of the inoculum blank.This corrected depletion was then divided by the concentration of the test substance to obtain the specific BOD as mg oxygen per mg test substance and, finally, the % of biodegradation was obtained by dividing the specific BOD by the specific COD.

Applicant's summary and conclusion

Interpretation of results:
not inherently biodegradable
Conclusions:
the substance is classified "not readly biodegradable".