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Toxicity to terrestrial arthropods

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Description of key information

The chemical safety assessment according to Annex I of Regulation (EC) No. 1907/2006 does not indicate the need to investigate further the toxicity to terrestrial arthropods.

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In accordance with Regulation (EC) No. 1907/2006, Annex IX, column 2, 9.4 further studies on the effects on terrestrial organisms do not have to be conducted since the chemical safety assessment indicates that there is no need. No experimental data on toxicity to terrestrial arthropods are available ethane-1,2-diyl palmitate (CAS 624-03-3). The test substance is characterised by a high log Koc indication a considerable potential for adsorption to the soil particles. Therefore, tests with soil-dwelling organisms that feed on soil particles are most relevant for the evaluation of soil toxicity of ethane-1,2-diyl palmitate. Read-across in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 from structurally related category members butylene glycol dicaprylate / dicaprate (CAS 853947-59-8) and decanoic acid, mixed diesters with octanoic acid and propylene glycol (CAS 68583-51-7) did not show any mortality to earthworms in acute tests according to OECD 207 and EU Method C.8, respectively (LC50 > 1000 mg/kg soil dw). A plant study with butylene glycol dicaprylate / dicaprate according to OECD 208 with three species from different taxonomic groups resulted in an EC50 of > 100 mg/kg soil for all tested species. Moreover, the read-across substance butylene glycol dicaprylate / dicaprate did not show any chronic effects up to the limit of water solubility on the water flea Daphnia magna in a study according to OECD 211. This read-across is justified in detail in the overall summary (IUCLID chapter 6.3) and within the category justification in IUCLID Section 13. In this case of read-across, the best suited (highest degree of structural similarity, nearest physico-chemical properties) read-across substance was used for the assessment. Since the substance is readily biodegradable, a chronic exposure of terrestrial organisms is not likely. Thus, acute tests with terrestrial organisms from different taxonomic groups in combination with chronic aquatic data indicating no effects up to the limit of water solubility are sufficient to assess the toxicity to terrestrial organisms.