[No public or meaningful name is available]

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

09 January 2018 - 01 June 2018

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Test material form:

semi-solid (amorphous): gel

Study design

Inoculum or test system:

activated sludge, non-adapted

Results and discussion

Preliminary study:

From the preliminary solubility work and following the recommendations of the
International Standards Organisation (ISO 10634, (1995)) and Handley et al (2002) it was
concluded that the best testable dispersions were found to be obtained when using the
high shear mixing method of preparation and solvent with high shear mixing method of
preparation. As there was no difference between these methods of preparation it was
considered appropriate to use high shear mixing alone to disperse the test item into the
test system.

% Degradation

Key result

Parameter:

% degradation (CO2 evolution)

Value:

ca. 80

Sampling time:

28 d

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

not readily biodegradable

Conclusions:

The test item attained 80% biodegradation after 28 days exhibiting the potential for rapid
degradation. Degradation did not satisfy the 10-Day window validation criterion, whereby
60% biodegradation must be attained within 10 days of the biodegradation exceeding 10% to
be considered readily biodegradable.