Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

Administrative data

Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 10- 12, 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 306 (Biodegradability in Seawater)
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Fatty acids C10-20, reaction product with diethylenetriamine
EC Number:
940-308-0
IUPAC Name:
Fatty acids C10-20, reaction product with diethylenetriamine
Test material form:
liquid: viscous
Details on test material:
Test substance: Fatty acids, C10-20 neo, reaction product with diethylenetriamine
Old name of the test substance: MK195K
Stability: No particular stability concerns
Solubility: Insoluble
Odor: Aromatic
Storage: room temperature
Specific details on test material used for the study:
Old name of the test substance: Naphthenic acids, reaction products with diethylenetriamine.

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
other: seawater
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
2 mg/L
Based on:
test mat.

Results and discussion

% Degradation
Key result
% Degr.:
15
Parameter:
CO2 evolution
Sampling time:
28 d
Transformation products:
not specified

Any other information on results incl. tables

The COD for test item was determined to be 2.03 mg O2 per mg substance.

The maximum percent biodegradation for the test substance of 15% was observed on day 28.

The sodium acetate 2mg/L reference control achieved greater than 60% biodegradation within the 28 day test period.

Dissolved oxygen depletion in the seawater controls remained within the test guideline of 30%; on day 28 a maximum dissolved oxygen depletion of 5.6% occurred. Control oxygen level had decreased from 7.2 mg/L on day 0 to 6.8 mg/L on day 28.

Applicant's summary and conclusion

Validity criteria
Validity criteria fulfilled:
yes
Conclusions:
The maximum biodegradation percent for Fatty acids, C10-20 neo, reaction product with diethylenetriamine of 15% was observed on day 28.