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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
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Data is from study report by Commission of the European Communities
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Principles of method if other than guideline:
Ready biodegradability test was carried out to find biodegradation of chemical 3,7-dimethylocta-2,6-dienenitrile according to OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test).
GLP compliance:
not specified
Oxygen conditions:
not specified
Inoculum or test system:
other: Sewage + Sludge
Details on inoculum:
-Concentration of dry substance is 30mg/l.
-As inoculum a mixture of (proportion) 1: 1 of municipal sludge from laboratory wastewater treatment plants fed with municipal sewage and sludge from BASF wastewater treatment plant was used.
Duration of test (contact time):
35 d
Initial conc.:
30 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation:
other: BOD of ThOD
Reference substance:
aniline
Parameter:
other: BOD of ThOD
Value:
59
Sampling time:
10 d
Parameter:
other: BOD of ThOD
Value:
100
Sampling time:
35 d
Details on results:
No data available
Results with reference substance:
Referance substance degraded to 80 – 90 % within 14 days (10 d window covered).
Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable, but failing 10-day window
Conclusions:
After 35 days the test substance was degraded up to 100 % (BOD of ThOD) while in 10 days the degradation was found to be 59%. The test substance
was considered to be biodegradable.
Executive summary:

Ready biodegradability test was carried out to find biodegradation of chemical 3,7-dimethylocta-2,6-dienenitrile. As inoculum a mixture of (proportion) 1: 1 of municipal sludge from laboratory wastewater treatment plants fed with municipal sewage and sludge from BASF wastewater treatment plant was used. The concentration of the dry substance was 30 mg/l. After 35 days the test substance was degraded up to 100 % (BOD of ThOD).Hence,the test chemical 3,7-dimethylocta-2,6-dienenitrile was found to be biodegradable(10 days window was not covered)with 59% biodegradation in 10 days.

Description of key information

Ready biodegradability test was carried out to find biodegradation of chemical 3,7-dimethylocta-2,6-dienenitrile. As inoculum a mixture of (proportion) 1: 1 of municipal sludge from laboratory wastewater treatment plants fed with municipal sewage and sludge from BASF wastewater treatment plant was used. The concentration of the dry substance was 30 mg/l. After 35 days the test substance was degraded up to 100 % (BOD of ThOD). Hence, the test chemical 3,7-dimethylocta-2,6-dienenitrile was found to be biodegradable(10 days window was not covered)with 59% biodegradation in 10 days.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable but failing 10-day window

Additional information

Ready biodegradability test was carried out to find biodegradation of chemical 3,7-dimethylocta-2,6-dienenitrile. As inoculum a mixture of (proportion) 1: 1 of municipal sludge from laboratory wastewater treatment plants fed with municipal sewage and sludge from BASF wastewater treatment plant was used. The concentration of the dry substance was 30 mg/l. After 35 days the test substance was degraded up to 100 % (BOD of ThOD). Hence, the test chemical 3,7-dimethylocta-2,6-dienenitrile was found to be biodegradable(10 days window was not covered)with 59% biodegradation in 10 days.