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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation in water (screening test): Readily biodegradable but failing 10-day window (Hall, 2012); OECD 301B.

Key value for chemical safety assessment

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

Additional information

The ready biodegradability of HCAT was assessed over a 28-day period by the CO2 Evolution (Modified Sturm) Test. The study was conducted in accordance with procedures outlined in OECD Guideline 301B. Data generated from one test bioreactor demonstrated HCAT to be readily biodegradable since a transition from 10 to 60% degradation in a 10 day window was achieved. Data from the replicate bioreactor just failed to meet this criteria by <3%; observations made throughout the test indicated that the dispersion of HCAT was incomplete in this bioreactor.

The test item, HCAT, was extensively biodegraded in this study (88 -96 %). The cumulative biodegradation data were, however, borderline for the classification of ready biodegradability; where the assessment just failed to satisfy the guideline criteria, therefore the classification of "readily biodegradable but failing the 10 -day window" was applied.