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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The substance has been shown to be readily degradable in manometric respirometry test.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Ready biodegradability was tested according to the manometric repirometry test (OECD 301 F, 1192) and in compliance with GLP. Nominal initial test substance concentration was 100 mg/L. The test was performed with inoculum prepared by taking two 50 ml samples of the homogenised sludge, evaporating water on a steam bath, drying in an oven at 105- 110 °C for two hours and weighing the residue. The test substance at 100 mg/L achieved mean degradations of 77% by day 7, and 82% by the end of the study. The viability of the inoculum and validity of the test were supported by the results of the reference substance, sodium benzoate, which degradation approximately exceeds 40 % after 7 days and 65 % after 14 days.

The day-7 results clearly show that the 10-day window criterion was met. The substance is considered to be readily biodegradable under the conditions of the test.