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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

In an OECD 301B valid study (Hydrotox GmbH, 2011a), the degradation extent of the test material (alpha-methyl cinnamaldehyde (Cyprinal)) was 97.0% within 28 days after acidification.

In a supporting Closed Bottle Biodegradability Test conducted according to Council Directive 92/69 EEC, Method C.4-E (Bayer, 1999a), within the test period of 28 days, a degradation rate of 63% was determined for Methyl cinnamic aldehyde alpha. Methyl cinnamic aldehyde alpha is therefore classified as "Readily Biodegradable".

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In a key OECD 301B valid study (Hydrotox GmbH, 2011a), the degradation extent of the test material (alpha-methyl cinnamaldehyde; CAS# 101 -39 -3) was 97.0% within 28 days after acidification (mean of three replicates).

On day 4 the mean degradation extent of the test material was 2.6% and reached 77.4% by day 11. Therefore the test material (alpha-methyl cinnamaldehyde) reached the pass level for ready biodegradability (60% ThCO2 and 10 -day window).

In a supporting Closed Bottle Biodegradability Test conducted according to Council Directive 92/69 EEC, Method C.4-E (Bayer, 1999a), the test material (Methyl cinnamic aldehyde alpha; CAS# 101-39-3) was suspended in a mineral medium, inoculated with a mixed population of aquatic microorganisms and incubated for 28 days under aerobic conditions in the dark at 20 ± 1°C. During this period, the biodegradation of the test substance was determined an the basis of the reduction of dissolved oxygen.

A degradation rate of 76% for sodium benzoate, the reference substance, was achieved within 14 days. Within the test period of 28 days, a degradation rate of 63% was determined for Methyl cinnamic aldehyde alpha. Methyl cinnamic aldehyde alpha is therefore classified as "Readily Biodegradable".