2-Oxetanone, 3-C12-16-alkyl-4-C13-17-alkylidene derivs., (4E)-

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The current study was conducted according the Guideline OECD 301D under GLP. This study is not the most suitable study due to the low water solubility

Justification for type of information:

The performed OECD 301D (closed bottle) is not the most suitable method for this substance as the water solubility is very low. The concentrations used in the study were above the water solubility of the substance. During the study no agitation was used to keep the chemical dispersed, which could lead a lower bioavailability for the bacteria in the inoculum. Based on the similarity of the structure of both substance it would be expected that liquid AKD would also be readily biodegradable. In particular, the double bond in the chain could lead to a faster break down of the structure.
A new readily biodegradation study (OECD 301B) will be performed to confirm the readily biodegradability of the substance.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2001

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

(4E)-4-(C13-C17)alkenylidene-3-(C12-C16)alkenyl oxetan-2-one

EC Number:

939-401-9

Cas Number:

1469983-41-2

Molecular formula:

Cx Hy O2 with x ranges 32 to 36 and y ranges from 56 to 66 Molecular formula of the main dimer: C36H64O2 ( dimer from 2 C18:1 fatty acids)

IUPAC Name:

(4E)-4-(C13-C17)alkenylidene-3-(C12-C16)alkenyl oxetan-2-one

Study design

Inoculum or test system:

other: secondary effluent of a municipal treatment plant

Duration of test (contact time):

28 d

Reference substance

Reference substance:

acetic acid, sodium salt

Results and discussion

% Degradation

Parameter:

% degradation (CO2 evolution)

Value:

45

Sampling time:

28 d

BOD5 / COD results

Results with reference substance:

Reference substance demonstrated 63% degradation at day 7, 76% at day 14, 75% at day 21, and 80% at day 28. This was considered valid.