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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

The BCF value of 21.7 indicates a negligible potential of OPP to bioaccumulate.

Key value for chemical safety assessment

Additional information

To evaluate the bioaccumulation potential of OPP (CAS-No. 90-43-7) a flow-through study according to Directive 67/548/EC, C.13 was conducted. The Test was carried out with individuals of zebra fish (Danio rerio). A dosing system was used to maintain water concentrations (nominal) of 5.0 and 50 µg OPP/L for the 53-h exposure period. After exposure, the test fish were placed in clean water to determine the depuration of the test substance (Caspers, 1999).

At both test substance concentrations, the arithmetic means of five consecutive steady-state BCF were 21.7, indicating a negligible potential of the test substance to bioaccumulate. The achievement of steady-state conditions during the uptake (53 h exposure) phase as well as the subsequent depuration (19 h) were rapid processes.

The steady-state bioconcentration factor (BCF) of 21.7 indicates a negligible potential of OPP to bioaccumulate.