[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:

from 2005-09-15 to 2005-10-14

Reliability:

1 (reliable without restriction)

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2005

Report date:

2005

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

adopted 1992-07-17

Deviations:

no

Principles of method if other than guideline:

NA

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Details on test material:

Batch no: EZ06-B001;

Specific details on test material used for the study:

Details on properties of test surrogate or analogue material (migrated information):
NA

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, domestic, adapted

Details on inoculum:

The activated sludge was washed twice with autoclaved tab water and maintained in an aerobic condition by aeration for 4 hours and then homogenised with a mixer. Thereafter the sludge was filtered with folded filter and aerated with CO2-free air for 5 days. 25 ml/l were used to initiate inoculation.

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

15 mg/L

Based on:

test mat.

Parameter followed for biodegradation estimation

Parameter followed for biodegradation estimation:

CO2 evolution

Details on study design:

NA

Reference substance

Reference substance:

acetic acid, sodium salt

Results and discussion

Preliminary study:

NA

Test performance:

The functional and the toxicity control confirmed the validity of the test.

% Degradation

Parameter:

% degradation (CO2 evolution)

Value:

17

Sampling time:

28 d

Details on results:

NA

BOD5 / COD results

Results with reference substance:

34 % biodegradation occurred within 14 days and with a maximum of 43 % after 28 days.

Any other information on results incl. tables

NA

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

other: not ready biodegradable

Conclusions:

The test item is not ready biodegradable.

Executive summary:

The test item is not ready biodegradable.