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Toxicity to terrestrial plants

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Description of key information

EC50 (21 d)  263.79 mg/kg soil based on freshweight of Avena sativa (OECD 208)

Key value for chemical safety assessment

Additional information

Since no studies investigating the toxicity to terrestrial plants of ethylene distearate (CAS 627-83-8) are available for this endpoint, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read across to a structurally related category member butylene glycol dicaprylate / dicaprate (CAS 853947-59-8) was conducted. 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. Nevertheless, as it can be seen in the data matrix of the category justification in section 13 and the overall summary, all reliable data in the category support the hazard assessment of each category member by showing a consistent pattern of results.

The study was performed according to OECD 208 with two dicotyledon (Raphanus sativus & Glycine max) and one monocotyledon species (Avena sativa) (Spatz, 2002). Five different concentrations up to 1000 mg/kg soil were tested and the effect parameters germination, phytotoxicity, growth stages, mortality and fresh weight were measured after 21 d. The most sensitive species based on fresh weight was Avena sativa with an EC50 of 263.79 mg/kg soil (NOEC 39 mg/kg soil), followed by Raphanus sativus and Glycine max with an EC50 of 526.47 and 2978.54 mg/kg soil, respectively. Moreover, the test substance caused a statistically significant reduction in germination of Raphanus sativus (from 444 mg/kg soil onwards) but did not affect germination rate of Avena sativa and Glycine max. Phytotoxic effects appeared as reduction of growth stages of Raphanus sativus and Avena sativa. No mortality occurred in soil treated with the test substance. All tested species showed the same effects, which are not typical phytotoxic effects as known for plant protection products (e.g. chlorosis and necrosis). The effects are resembled more growth depression like caused by a permanent water deficiency from the beginning of germination. Observed effects might have been caused by obstruction of water uptake through the roots.

Based on the results from a structurally related read-across substance (in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5) which is characterized by an equal ecotoxicological profile, it can be concluded that effects of ethylene distearate to terrestrial plants will be in the same range.