Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

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
Study period:
2003
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study with abridged report

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2003
Report date:
2003

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
GLP compliance:
no

Test material

Constituent 1
Reference substance name:
Zinc bis[12-hydroxyoctadecanoate]
EC Number:
252-669-5
EC Name:
Zinc bis[12-hydroxyoctadecanoate]
Cas Number:
35674-68-1
IUPAC Name:
zinc bis(12-hydroxyoctadecanoate)
Test material form:
other: solid

Study design

Details on inoculum:
activated sludge from the aeration pool of the domestic sewage treatment plant in Neustadt, Germany sampled on 2001-02-06
Duration of test (contact time):
29 d

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (CO2 evolution)
Value:
14.5
Sampling time:
4 d
Parameter:
% degradation (CO2 evolution)
Value:
53.5
Sampling time:
13 d
Parameter:
% degradation (CO2 evolution)
Value:
72
Sampling time:
29 d
Details on results:
In a OECD 301B test, 72% of Zinc-12-Hydroxystearate degraded biologically in 29 days (71% in 28d) as measured by carbon dioxide emission. Zinc-12-Hydroxystearate is readily biodegradable as the 60% level was passed within 28 days but failed the 10 day window criteria.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable, but failing 10-day window
Conclusions:
Altogether, 71% of zinc-12-hydroxystearate was biodegraded after 28 days as determined in the test according to OECD 301B. This value was calculated from emitted carbon dioxide. Zinc-12-Hydroxystearate is readily biodegradable as the 60% level was passed within 28 days but failed the 10 day window criteria.
Executive summary:

Altogether, 71% of zinc-12-hydroxystearate was biodegraded after 28 days as determined in the OECD 301B test with 14.5 % after 4 days and 53.5% after 13 days. Zinc-12-hydroxystearate is readily biodegradable as the 60% level was passed within 28 days but failed the 10 day window criteria.