Overbased reaction products of distilled tall oil and magnesium hydroxide’

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.002 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

no hazard identified

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.007 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.001 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:

0.056 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Acute studies are available for fish, Daphnia and algae based on read across. The lowest acute effects were observed at 1.6 mg/L, for Daphnia.

Conclusion on classification

Under CLP legislation there would be no environmental classification for either the rosin or fatty acid components of Distilled tall oil, magnesium salt.

There are a wide range of ecotoxicity results for the rosin component of the substance. The lowest EC50 is 1.6 mg/L. As this is >1 mg/L no acute environmental classification is assigned to the rosin component of Fatty acids, tall oil, magnesium salts. A chronic environmental classification is not assigned to the rosin component of the substance as although the lowest EC50 result is between 1 and 10 mg/L the rosin component is readily biodegradable and a measured BCF study for resin acids determined BCF values <500.

The lowest EL50 result for the fatty acid component of Distilled tall oil, magnesium salt is 13 mg/L. As this is >1 mg/L no acute environmental classification is assigned to the fatty acid component. A chronic environmental classification is not assigned to the fatty acid component of the substance as although the lowest EC50 result is between 10 and 100 mg/L the fatty acid component is readily biodegradable and a calculated Log Kow values indicate that the log Kow value is <4.

Based on the available information neither the rosin or fatty acid component of Distilled tall oil, magnesium salt would be classified for the environment, and neither is classified by the Lead Registrant of these substances. Therefore Distilled tall oil, magnesium salt is not classified for the environment under the CLP regulation.

Under the DSD regulation there would be no environmental classification for either the rosin or fatty acid components of Distilled tall oil, magnesium salt.

No acute classification would be assigned to the rosin component as the lowest EC50 value is >1 mg/L. No chronic environmental classification would be assigned as although the lowest EC50 is between 1 and 10 mg/L the rosin component is considered to be readily biodegradable. Measured BCFs are available for ten resin acids ranging from <25 - 129, of these nine have BCF values <100. Therefore it is considered that overall the rosin component has low potential for bioaccumulation. A chronic classification is not therefore applicable for the rosin component.

 

No acute classification is assigned to the fatty acid component as the lowest EL50 value is >1 mg/L. No chronic classification is assigned as although the lowest EL50 is between 10 and 100 mg/L the fatty acid component is readily biodegradable.

 

Based on the available information neither the rosin or fatty acid component of Distilled tall oil, magnesium salt would be classified for the environment, and neither is classified by the Lead Registrant of these substances. Therefore Distilled tall oil, magnesium salt is not classified for the environment under the DSD regulation.

For poorly water soluble substances, such as Distilled tall oil, magnesium salt, a precautionary classification of Chronic Category 4 (CLP) or R53 (DSD) may be applied. However, this is not appropriate here as Distilled tall oil, magnesium salt is readily biodegradable.