Copper dioleate

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03. Aug. 2016 - 07. Sept. 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

adopted 17. Jul. 1992
“CO2-Evolution-Test (Modified STURM Test)“

Deviations:

yes

Remarks:

Temperature range was 18.9 – 23.4 °C instead of 20.0 – 24.0 °C. As degradation of the positive control was in the normal range this is considered as uncritical concern-ing the outcome of the study.

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)

Version / remarks:

adopted 30. May 2008

GLP compliance:

yes (incl. QA statement)

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, domestic, non-adapted

Duration of test (contact time):

28 d

Initial conc.:

20 mg/L

Based on:

test mat.

Remarks:

orresponding to 29.1 mg Copper dioleate/L)

Parameter followed for biodegradation estimation:

CO2 evolution

Reference substance:

aniline

Key result

Parameter:

% degradation (CO2 evolution)

Remarks:

degradation at the end of 10-day-window

Value:

54

Sampling time:

13 d

Remarks on result:

not readily biodegradable based on QSAR/QSPR prediction

Key result

Parameter:

% degradation (CO2 evolution)

Remarks:

at the end of the test

Value:

54

Sampling time:

28 d

Details on results:

The following data were determined for the test item Copper dioleate:
10-day-window: day 3 – 13
degradation at the end of 10-day-window 54 %
degradation at the end of the test 59%

Validity criteria fulfilled:

yes

Interpretation of results:

not readily biodegradable

Executive summary:

All validity criteria were met.

Degradation behaviour of positive control and toxicity control was normal. Abiotic degradation reached 1 %. Both replicates of the test item showed very good correspondence. If degradation in the toxicity flask is below 25% after 14 days, the test item can be considered as toxic towards the inoculum. As degradation in the toxicity flask was 64% after 14 days, the test item can be stated as “not toxic towards the inoculum in a concentration of 29.3 mg/L”. Ready degradability is defined in the guidelines as degradation surpassing 60% within 10 days after reaching a level of 10%. Therefore, the test item Copper dioleate must be considered as “not readily biodegradable”. No observations were made which might cause doubts concerning the validity of the study outcome. The result of the test can be considered valid.

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable but failing 10-day window