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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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According to Column 2 of Annex IX of REACH (section 9.4. Effects on terrestrial organisms), in the absence of toxicity data for soil organisms, the equilibrium partitioning method may be applied to assess the hazard to soil organisms. The choice of the appropriate tests depends on the outcome of the chemical safety assessment.

Soil toxicity tests with barium di(acetate) are not considered to be required for the following reasons:

(I)                 Based on a weight-of-evidence approach, study available for arthropod F. candida indicates a low potential for toxicity of barium to soil organisms. A low potential for toxicity of acetic acid to soil organisms is also concluded.

(II)               Barium and acetate do not bioaccumulate or biomagnify in terrestrial organisms. Low strontium bioaccumulation factors were measured for barium in terrestrial plants. Aquatic bioaccumulation of barium and acetate are also low.

(III)             Neither barium nor acetate have a high potential to partition into soil and predominantly exist as ionised forms.

(IV)             Based on the absence of a hazard potential of barium di(acetate) in the aquatic compartment, a similar low potential is assumed in soil. Available aquatic toxicity studies for barium and acetate also point to a low toxic potential in aquatic systems.

In sum, the low toxic potential of barium di(acetate) as well as its dissolved ions barium and acetate to aquatic organisms and the low potential to adsorb to soil indicate a low if any toxic potential of barium di(acetate) in soil. Therefore, it is not justified to conduct any further terrestrial toxicity study with barium di(acetate).

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