Dibutylphthalate

Definition of dibutylphthalate (DBP): Dibutylphthalate belongs to the family of phthalates: industrial chemicals used as plasticizers, softeners, adhesives or solvents used by a variety of industries. They are used in PVC, paints, printing inks, cosmetics, coatings of cars,... This is the common definition for dibutylphthalate (DBP), other definitions can be discussed in the article

Notes

Dibutylphthalate
Formula
C16H2204

In 1998, 26.000 ton of dibutylphthalate was produced in the EU of which 18.000 ton was consumed in the EU.

DBP can enter the marine environment through waste water effluents. Also cleaning of road tankers releases DBP in the aquatic environment. DBP has a low water solubility (10 mg/l), and tends to adsorb to sediment. It is very stable but can be biodegraded, causing it to have an environmental half-life of 50 days. It has some potential to bioaccumulate in some organisms, however because of its biodegradability it is not expected to biomagnify through food chains. Concentrations above 0,04 mg/l are shown to cause adverse effects on aquatic invertebrates and concentrations above 0,2 mg/l can have lethal effects. Concentrations above 0,5 mg/l can cause acute toxicity for fishes. It has also been show to be able to act as an endocrine disruptor in vertebrates. As such it causes adverse effects on the development and reproduction of rats.

Concentrations in sea water have been as high as 3 µg/l, although they are usually below 0,5 µg/l. Concentrations in sediments are below 2,4 mg/kg dry weight and usually around 0,01 mg/kg dry weight.

Therefore there is a potential risk for ecotoxicological effects on aquatic species in the marine environment, but only at a local scale and mainly for organisms living in sediments.

Environmental standards and legislation

Included in the OSPAR list of substances of priority action

See also

OSPAR background document on phthalates