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Ecotoxicological information

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Aquatic compartment (1)

Both short-term and long-term aquatic toxicity data are available for DBP. The PNEC for the aquatic compartment is derived from the 99-day NOEC of 100 μg/l for Onchorhynchus mykiss. This key study is supported by the Gammarus pulex study in which a similar value was found based on a decrease in the locomotor activity. An assessment factor of 10 will be used for the extrapolation. This factor is used because long term NOECs for three trophic levels are available. The PNECaquatic amounts to 10 μg/l.

As there are no valid experimental data for the toxicity of DBP to sediment-dwelling organisms, the equilibrium method is used for the derivation of a PNEC in sediment:

PNECsediment = 1.2 mg/kg wwt.

The test with the protozoan Tetrahymena pyriformis can be used to derive a PNECmicroorganisms.

Applying a factor 10 on the EC50 of T. pyriformis leads to a PNEC value of 0.22 mg/l. It is realised that this PNEC is low compared to the fact that no biodegradation impairment of DBP was found at concentrations far above the water solubility.

(1) according:

European Union Risk Assessment Report dibutyl phthalate, Volume 29, p. 8 (2003)

Editors: B. G. Hansen, S.J. Munn, R. A/Ianou, F. Berthault, J. de Bruin, M. Luotamo, C. Musset, S. Pakalin, G. Pellegrini, S. Scheen S. Vegro.

Office for Official Publications of the European Communities, ISBN 92—894—1276—3