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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
GLP compliance:
not specified
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
41 d
Parameter:
% degradation (CO2 evolution)
Value:
11
Sampling time:
8 d
Parameter:
% degradation (CO2 evolution)
Value:
34
Sampling time:
21 d
Parameter:
% degradation (CO2 evolution)
Value:
56
Sampling time:
28 d
Parameter:
% degradation (CO2 evolution)
Value:
65
Sampling time:
40 d
Parameter:
% degradation (CO2 evolution)
Value:
73
Sampling time:
41 d
Details on results:
The microbial degradation of ferrocene was on average 11% after 8 days and rose nearly linearly to the 40th Day. On 27 days, after contact of the medium, the mean reduction was 56%, rising to 73% on the 41st Day. Degradation occurs in a linear pattern so, by extrapolation, 100% mineralisation will occur < 60days
Validity criteria fulfilled:
yes
Interpretation of results:
inherently biodegradable
Conclusions:
In study performed to OECD Guideline 301 B, ferrocene failed to meet the criteria for ready biodegradability. It has been classified as Inherently biodegradable because by day 27 degradation was 56%, rising to 73% by day 41. Degradation occurs in a linear pattern so, by extrapolation, 100% mineralisation will occur

Description of key information

In study performed to OECD Guideline 301 B, ferrocene is inherently biodegradable

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable
Type of water:
freshwater

Additional information

In study performed to OECD Guideline 301 B, ferrocene failed to meet the criteria for ready biodegradability. It has been classified as Inherently biodegradable because by day 27 degradation was 56%, rising to 73% by day 41. Degradation occurs in a linear pattern so, by extrapolation, 100% mineralisation will occur <60days.