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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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According to Regulation (EC) No.1907/2006, Annexes IX and X, Column 2, further testing for ultimate biodegradation in surface water or sediment shall be proposed if the chemical safety assessment according to Annex 1 indicates the need to investigate further the degradation of the substance or its degradation products; additional testing need not be proposed if direct and indirect exposure to the relevant environmental compartment is unlikely.  BTDA hydrolyses rapidly in water (half-life < 10 minutes); ultimate degradation is expected to occur in a timeframe of days to weeks (based on the timeframe predicted by BIOWIN 3).  The chemical safety assessment did not indicate the need to investigate the degradation of BTDA; the risk characterisation ratios for surface water are below one. Therefore, in accordance with Annex I, the risks are considered controlled. 
According to Regulation (EC) No.1907/2006, Annexes IX and X, Column 2, further testing for ultimate biodegradation in sediment need not be conducted if direct and indirect exposure to sediments is unlikely. The Koc for BTDA is 307.2; this value falls below the range of Koc values of 500-1000, below which substances are unlikely to adsorb to sediment. The chemical safety assessment did not indicate the need to investigate the degradation of BTDA; the risk characterisation ratios for sediment are below one. Therefore, in accordance with Annex I, the risks are considered controlled.

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