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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

NOEC (21d) 39 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 Propyleneglycol dioleate (CAS 105-62-4) are available, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read across to the structurally related substance 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 analogue justification in IUCLID Section 13.

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. The most sensitive species based on fresh weight was Avena sativa with an NOEC (21d) of 39 mg/kg soil, followed by Raphanus sativus and Glycine max with an NOEC (21d) of 87.8 and 197.5 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 the effects of Propyleneglycol dioleate will be in the same range.