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
Study period:
1990
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: well performed study but only weak documentation

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1990
Report Date:
1990

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
other: 79/831/EWG (part C),
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
purity: 95 - 97 % , contains residual water

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
no pretreatment of the inoculum
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
212 mg/L
Based on:
test mat.
Reference substance
Reference substance:
not specified

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
< 5
Sampling time:
7 d
Parameter:
% degradation (O2 consumption)
Value:
< 5
Sampling time:
14 d
Parameter:
% degradation (O2 consumption)
Value:
< 5
Sampling time:
21 d
Parameter:
% degradation (O2 consumption)
Value:
< 5
Sampling time:
28 d

Applicant's summary and conclusion

Interpretation of results:
other: not readily biodegradable
Conclusions:
Baes on the test result the substance has to considered as not readily biodegradable
Executive summary:

The substance was tested for ready biodegradation according to 79/831/EWG (part C), that is equivalent or similar to OECD guideline 301 C. In this manometric respiration test no biodegradation as found during 28 days.