Registration Dossier
Registration Dossier
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EC number: 292-832-8 | CAS number: 91001-61-5
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
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.
Key value for chemical safety assessment
Additional information
The terrestrial toxicity of Fatty acids, C16-18 and C18-unsatd., mixed esters with adipic acid and trimethylolpropane (CAS-No 91001-61-5) has been tested on the earthworm Eisenia foetida. The test substance is characterized by a high log Koc value (> 5), indicating high adsorption potential. Tests performed with a soil-dwelling organism that feeds on soil particles is therefore most relevant for the evaluation of soil toxicity Fatty acids, C16-18 and C18-unsatd., mixed esters with adipic acid and trimethylolpropane. Due to the ready biodegradability, low water solubility and high adsorption potential of this substance, it is not expected to be found in the soil pore water, and uptake by plants and soil microorganisms 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 and soil microorganisms 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.
No mortality or significant weight changes were observed in the control and the treatments during the test period of 4 weeks. Furthermore, no effects in reproduction up to the highest test concentration were observed. Based on reproduction the NOEC (8 weeks) was determined to be 1000 mg/kg dw soil.
Based on this information, Fatty acids, C16-18 and C18-unsatd., mixed esters with adipic acid and trimethylolpropane (CAS-No 91001-61-5) to terrestrial organisms is not expected to be of concern, and consequently, no further testing is proposed.
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