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Toxicity to soil microorganisms

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toxicity to soil microorganisms
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Dilactide hydrolyses rapidly to lactic acid. Lactic acid is readily biodegradable (see 5.2.1) and is an ubiquitous and essential molecule of life. It will not adsorb to soil (see IUCLID section 5.4.1). Accordingly, there is no relevance in the hazard assessment for soil organisms. Since dilactide undergoes immediate hydrolysis in contact with water, forming lactic acid, this is the moiety of interest by read-across. According to column 2 of REACH Annex IX, section 9.4, short-term toxicity to soil microorganisms can be assessed by the equilibrium-partitioning method if no terrestrial data are available. Lactic acid is practically non-toxic to aquatic organisms. Corrected for the pH effect, no hazard was identified for lactic acid/lactate. This can be safely extrapolated to the terrestrial compartment. Therefore, based on the chemical safety assessment according to Annex I and in accordance with column 2 of Annex X, section 9.4 of the REACH Regulation, testing of short/long-term toxicity to soil microorganisms is not required.

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