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Diss Factsheets

Ecotoxicological information

Toxicity to terrestrial arthropods

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Administrative data

Link to relevant study record(s)

Description of key information

No NOEC neither LC50 could be derived from the experimental data available. The Petrorisk model was used for the risk assessment;

Key value for chemical safety assessment

Additional information

According to Chapter R.7c (Endpoint specific guidance) of ECHA Guidance on information requirements and chemical safety assessment, in the case of readily biodegradable substances which are not directly applied to soil it is generally assumed that the substance will not enter the terrestrial environment and as such there is no need for testing of soil dwelling arthropods. According to the data provided in the dossier, C14-20 Aliphatics (≤2% aromatic) are readily biodegradable. Therefore, testing on soil dwelling arthropods is not required.


Moreover, some results are presented as supporting studies to demonstrate the need for high concentrations of hydrocarbons to obtain toxicity in terrestrial arthropods. Taverner et al. (1999) investigated the effects of two paraffin mixtures, C15 Ampol CPD (100% C15 alkanes) and C23 Ampol DC Tron NR (70% paraffins, 28% naphthenics, 2% aromatics), on the lepidopteran pest Epiphyas postvittana. Hydrocarbons were directly applied on the organisms and 24h-LC50 varied from 0.47 ml/L (i.e. approximately 375 mg/L) for the larval stage Instar III to more than 50 ml/L (i.e. 37.5 g/L) for the adults. The 14-day NOEC for instar III was found to be 0.1 ml/L (i.e. approximately 80 mg/L).