[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

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2006

Report date:

2006

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes

Test material

Test material information

Constituent 1

Details on test material:

- Name of test material (as cited in study report): T-159
- Molecular weight (if other than submission substance): 848.11
- Substance type: toner additive; charge control agent
- Physical state: solid
- Analytical purity: 99.5%
- Impurities (identity and concentrations): unknown
- Lot/batch No.: K-409

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge (adaptation not specified)

Details on inoculum:

9 mg each of the activated sludge was inoculated into the test vessel to make 30 mg/l as the concentration of suspended solid. After inoculation, the volume of the test solution was made to 300 ml with the basal culture as necessary.

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

10 mg/L

Based on:

test mat.

Parameter followed for biodegradation estimation

Parameter followed for biodegradation estimation:

O2 consumption

Results and discussion

% Degradation

% Degradation 1

Parameter:

% degradation (O2 consumption)

Value:

ca. 2

Sampling time:

28 d

% Degradation 2

Parameter:

% degradation (test mat. analysis)

Value:

ca. 0

Sampling time:

28 d

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

under test conditions no biodegradation observed

Conclusions:

Test substance is a persistent substance.