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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:
weight of evidence
Study period:
1979
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study without detailed documentation.
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method C.5 (Degradation: Biochemical Oxygen Demand)
Deviations:
yes
Remarks:
No reference substance was reported, and results were only based on one measurement not three.
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method C.6 (Degradation: Chemical Oxygen Demand)
Deviations:
not specified
Remarks:
no details were provided
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic (adaptation not specified)
Details on inoculum:
The BOD tests were conducted with partly adapted effluent from a biological sanitary waste treatment plant.

The 500 ml test solutions were seeded with a filtered 10 ml volume of the effluent from a biological sanitary waste treatment plant. In some cases an adapted seed was prepared and used.
Duration of test (contact time):
5 d
Parameter:
% degradation (O2 consumption)
Value:
53
Sampling time:
5 d
Parameter:
BOD5
Value:
1.19 other: g O2/g test mat. (non-adapted)
Parameter:
BOD5
Value:
1.72 other: g O2/g test mat. (adapted)
Parameter:
COD
Value:
2.23 g O2/g test mat.
Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable
Conclusions:
Isopropanol, the organic moity formed upon hydrolysis of aluminium ispropanolate, biodegrades rapidly in the environment.
Executive summary:

A BOD5/COD ratio ≥ 0.5 is considered as indicative of rapid degradation. Thus, a substance which passes this screening test is considered likely to biodegrade 'rapidly' in the aquatic environment, and is thus unlikely to be persistent.

Description of key information

The organic moiety isopropanol, formed immediately when aluminium isopropanolate comes in contact with moisture or water, is rapidly biodegradable, whereas the aluminium cation formed is ubiquitous in the environment. As the risk assessment will be based on aluminium (III) species, no conclusion on degradation of this inorganic species can be drawn. It is assumed that the aluminium species remain in the water phase.

Key value for chemical safety assessment

Additional information

Testing of aluminium isopropanolate for biodegradation is technically not feasible as the substance immediately dissociates to Al3+ species and isopropanol upon contact with water or moisture. Iso-propanol is known to be rapidly biodegradable as demonstrated by the supportive study with a BOD5/COD ration > 0.5. Thus the organic moiety of the test substance is considered rapidly biodegradable.