Strontium bis(2-ethylhexanoate)

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.42 mg/L

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

1.23 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.04 mg/L

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

36.8 mg/L

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

7.86 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.79 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

1.31 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Read-across approach

In the assessment of the environmental fate, ecotoxicity and toxicity of strontium bis(2-ethylhexanoate) (CAS: 2457-02-5), a read-across approach from data for the metal cation (strontium) and the organic anion (2-ethylhexanoate) is followed. This read-across strategy is based upon the observation that upon dissolution in aqueous media, strontium bis(2-ethylhexanoate) completely dissociates and only is present in its dissociated form, i.e. as strontium cations and 2-ethylhexanoate anions. Data on the environmental fate, ecotoxicity and toxicity for both transformation products (strontium cation and 2-ethylhexanoate anion) together can therefore be combined in an additive approach to predict the corresponding properties of strontium bis(2-ethylhexanoate).

A detailed justification for the read-across approach is added as a separate document in section 13 of IUCLID.

Upon dissolution and dissociation of strontium bis(2-ethylhexanoate) into the strontium cation and 2-ethylhexanoate anion, both ions will each show the proper (bio)degradation, bioaccumulation and partitioning behaviour in the environment, as reported for the corresponding ion. The environmental fate and behaviour for the strontium cation and 2-ethyl hexanoate anion is predicted to be clearly different from each other, resulting in a different relative distribution over the environmental compartments (water, air, sediment and soil). Because the relative exposure to both constituent ions is hence predicted to be different from the original composition of strontium bis(2-ethylhexanoate), data for the ecotoxicological properties of this substance tested as such are considered less relevant for its effects and risk assessment and a read-across approach from data for both the strontium cation and 2-ethyl hexanoate anion is preferred. The dose additivity approach is used to explain the ecotoxicological effects of strontium bis(2-ethylhexanoate) based on the data for the individual transformation products (strontium cation and 2-ethylhexanoate anion).

Conclusion on classification

No reliable ecotoxicological data are available for strontium bis(2-ethylhexanoate). The substance will dissociate into strontium cations and 2-ethylhexanoate anions after dissolution in water and hence can be regarded as a mixture of both constituent ions. In the absence of toxicity data for strontium bis(2-ethylhexanoate), its classification for environmental hazards is therefore based on the classification of the transformation products (strontium and 2-ethylhexanoate ions).

Both strontium and 2-ethylhexanoic acid are not classified as hazardous to the aquatic environment and therefore, it is concluded that strontium bis(2-ethylhexanoate) is not classified as hazardous to the aquatic environment.