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Environmental fate & pathways

Biodegradation in water: screening tests

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In a modified Sturm test DEGDB was found to have degraded by 17% after 2 days, 71% after 10 days, and by 93% at the end of the 28 -day biotic phase of the test (HLS 1998, VCL246/972257). The positive control substance, sodium benzoate, which was analysed contemporaneously degraded rapidly (65% degradation after 6 days), and confirmed that the inoculum was viable and that the test was valid. 
Substances are considered to be readily degradable in this test if CO2 production is equal to or greater than 60% of the theoretical value within ten days of the level achieving 10%. In the modified Sturm test, DEGDB met these criteria, so it is considered to be readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

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