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Toxicity to terrestrial plants

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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 plants.

Key value for chemical safety assessment

Additional information

No experimental data evaluating the toxicity of Glycerides, C16-18 mono- (CAS No. 91052-47-0) to terrestrial plants are available. The test substance is characterized by a log Kow (> 5) indicating high potential for adsorption to soil particles. Tests with soil-dwelling organisms that feed on soil particles are therefore most relevant for the evaluation of soil toxicity Glycerides, C16-18 mono- (Guidance on information requirements and chemical safety assessment, Chapter R7.c (ECHA, 2012)). Due to the low water solubility (< 1 mg/L) and high adsorption potential of this substance, it is not expected to be found in the soil pore water, and uptake by plants is therefore highly unlikely. On the other hand, the Guidance on information requirements and chemical safety assessment, Chapter R7.c states that earthworm testing allows potential uptake via surface contact, soil particle ingestion and pore water, while plant exposure will be largely via pore water (ECHA, 2012). Therefore, earthworm was chosen as the most suitable organism to assess the terrestrial toxicity of this substance. Earthworm toxicity data from a suitable read-across substance (Glycerides, C14-18 and C16-18 unsatd. mono-, di- and tri- (CAS No. 91052-28-7) in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5) are available. In this test performed according to OECD 207, no effects on survival or biomass of Eisenia fetida were reported, leading to a NOEC (14 d) ≥ 1000 mg/kg dw (Moser, 2013). Glycerides, C16-18 mono- is readily biodegradable. Therefore, rapid and ultimate degradation in the environment, including soil, can be expected. Chronic exposure of terrestrial organisms is thus very unlikely.

Based on the available information, the chemical safety assessment according to Regulation (EC) No. 1907/2006, Annex I, does not indicate the need to conduct further tests on terrestrial plants.