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Environmental fate & pathways

Biodegradation in water: screening tests

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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:
1992
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Guideline study with limited reporting. The study was peer-reviewed and rated reliable within the framework of the EU RAR Zinc distearate (CAS-No.: 557-05-1 & 91051-01-3 EINECS-No.: 209-151-9 & 293-049-4) Part 1 - Environment (Final report R074_0805_env, May 2008 . In accordance with Section 1 (0.5), Annex I of Regulation (EC) No 1907/2006 (REACH), this study was considered reliable with restrictions. Please note that an error occurred in the RAR regarding the conclusions of the study.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1992
Report Date:
1992

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Zinkstearat
- Substance type: according to information from study owner, generic name of test substance is Fatty acids, C16-18, zinc salts (CAS No.
91051-01-3)
- Batch: not stated
- Purity: not stated

- Physical state: white dusty solid

Study design

Duration of test (contact time):
>= 28 d

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
>= 14
Sampling time:
5 d
Parameter:
% degradation (O2 consumption)
Value:
>= 46
Sampling time:
15 d
Parameter:
% degradation (O2 consumption)
Value:
>= 93
Sampling time:
28 d
Details on results:
In a closed bottle test for biodegradation (OECD guideline 301 D), 93% biodegradability of zinc distearate was found in 28 days. This value was calculated from the BOD, the biological oxygen demand, and the ThOD, the theoretical oxygen demand.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable, but failing 10-day window
Conclusions:
Altogether, 93% of zinc stearate was biodegraded after 28 days as determined on the Closed Bottle test according to OECD 301D. This value was calculated from the BOD, the biological oxygen demand, and the ThOD, the theoretical oxygen demand. Zinc stearate is readily biodegradable as the 60% level was passed within 28 days but failed the 10 day window criteria.
Executive summary:

Altogether, 93% of zinc stearate was biodegraded after 28 days as determined on the Closed Bottle test according to OECD 301D with 14 % after 5 days and 46% after 15 days. Zinc stearate is readily biodegradable as the 60% level was passed within 28 days but failed the 10 day window criteria.