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Toxicity to terrestrial arthropods

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No experimental data on the toxicity of (Z)-N-octadec-9-enylhexadecan-1-amide (oleyl palmitamide, CAS 16260-09-6) to terrestrial arthropods are available.

The substance is characterised by a high log Koc (log Koc > 5) indicating a considerable potential for adsorption to the soil particles but as the substance is highly insoluble in water (< 0.01 mg/L), only low concentrations are expected in the pore water. Therefore, tests with soil-dwelling organisms like earthworm, which allow potential uptake via surface contact, soil particle ingestion and porewater (ECHA, 2012), are most relevant for the evaluation of soil toxicity. In addition, in the absence of a clear indication of selective toxicity, an invertebrate (earthworm or collembolan) test is preferred, as outlined in ECHA guidance section R.7.11.5.3, page 122. Thus, it can be assumed that earthworms would be highly exposed to toxicants in soil and hence are most sensitive to the potential adverse effects of the substance.