Registration Dossier

Environmental fate & pathways

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

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): T-126
- Molecular weight (if other than submission substance): 710.33
- Substance type: toner additive; charge control agent
- Physical state: solid
- Analytical purity: 99.32%
- Impurities (identity and concentrations): unknown
- Lot/batch No.: SP-015

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):
ca. 28 d
Initial test substance concentration
Initial conc.:
10 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimationopen allclose all
Parameter followed for biodegradation estimation:
O2 consumption
Parameter followed for biodegradation estimation:
test mat. analysis

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
2 - 5
Sampling time:
28 d
Parameter:
% degradation (test mat. analysis)
Value:
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.