Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Read-across was used. Hypothesis for the analogue approach: see files attached under section 13 assessment reports Read Across Justification. Test for source substance to biodegradation in water was performed according to OECD 301B and compliant with GLP.

Data source

Reference
Reference Type:
other: Body responsible for the test
Title:
Unnamed
Year:
1996

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
GLP compliance:
yes

Test material

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

Study design

Duration of test (contact time):
28 d
Reference substance
Reference substance:
other: sodium acetate

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
0.4
Sampling time:
28 d
Details on results:
Points of degradation plot (test substance):
0% degradation after 7 d
0.2% degradation after 9 d
0.4% degradation after 14 d
0.4% degradation after 29 d

BOD5 / COD results

Results with reference substance:
Points of degradation plot (reference substance):
46.4% degradation after 7 d
57% degradation after 9 d
65% degradation after 14 d
76.6% degradation after 29 d

Applicant's summary and conclusion

Interpretation of results:
other: not readily biodegradable
Conclusions:
The test substance is not readily biodegradable. The test substance (source substance) bis(hydrogenated tallow C16-C18-alkyl)hydroxylamine is a structurally very similar substance to target substance hydroxylamines, di-C16-18 (even numbered) alkyl. It can be reasonably assumed that target substance is also not readily biodegradable.