Reaction products of diphenyl ether and 9-methylene nonadecane

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: Test guideline under Japan Chemical Substances Control Law

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Reaction products of diphenyl ether and 9-methylene nonadecane

EC Number:

943-303-1

Molecular formula:

Variable, substance is a UVCB

IUPAC Name:

Reaction products of diphenyl ether and 9-methylene nonadecane

Test material form:

liquid

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, non-adapted

Details on inoculum:

Mixed Liquor Suspended Solids (MLSS): 3350 mg/L (BOD measurement) and 3000 mg/L (Recovery test)
Source: Chemical Evaluation and Research Institute, Japan
Date of Receipt: 2016-05-24

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

100 mg/L

Based on:

test mat.

Parameter followed for biodegradation estimation

Parameter followed for biodegradation estimation 1

Parameter followed for biodegradation estimation:

O2 consumption

Parameter followed for biodegradation estimation 2

Parameter followed for biodegradation estimation:

DOC removal

Parameter followed for biodegradation estimation 3

Parameter followed for biodegradation estimation:

test mat. analysis

Details on study design:

Temperature: 25 ± 1°C
Test volume: 300 mL

Test bottle contents :
Bottle 1 : Test substance + ultrapure water (Abiotic sterile control)
Bottle 2-4 : Test substance + activated sludge + basal medium (test suspension)
Bottles 3-5 : Activated sludge + aniline + basal medium (Positive control)
Bottle 6 : Basal medium (control)

The BOD was measured continously for 28 days.

Reference substance

Reference substance:

aniline

Results and discussion

Test performance:

From the biodegradability result based on BOD (average 3%) and that of the residual test item remaining (average 4%), it is concluded that the test substance is not readily biodegradable. With regards to DOC, since the DOC in water and test substance vessels was < 90% of the theoretical value, degradability was not calculated.

% Degradation

% Degradation 1

Parameter:

% degradation (O2 consumption)

Value:

3

Sampling time:

28 d

% Degradation 2

Parameter:

% degradation (test mat. analysis)

Value:

4

Sampling time:

28 d

Details on results:

-Degradability based on BOD
The degree of degradability based on the BOD measurements was 2, 2, and 5% for bottles 2, 3, and 4.
-Degradability based on DOC
Degradability was not calculated because the test substance showed low degradation
-Degradability based on the residual test substance concentration
The degree of degradability based on the residual test substance concentration was 2, 1, and 8 % for bottles 2, 3 and 4, respectively.

At the end of the experiment, the pH values were 8.7 for test susbtance suspension bottles with no sludge and 7.2 for test substance bottles with sludge.

BOD5 / COD results

Results with reference substance:

The degradability of aniline, based on the BOD measurements was 74 % after 7 days. The activity of the sludge was thus shown to be satisfactory.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

under test conditions no biodegradation observed

Conclusions:

It is concluded that the test substance was not readily biodegradable and no transformation products were generated under the conditions of the modified MITI test.