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Short-term toxicity to aquatic invertebrates

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Description of key information

The water accommodated fraction (WAF) of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, did not produce a 50% effect (immobility) with Daphnia magna at a loading of 1000 mg/L after a 48-hour exposure. Therefore, the 48-hour LL50 is reported as >1000 mg/L. There was no mortality at the 1000 mg/L loading level after 48 hours. Therefore, the 48-hour LL0 for mortality is reported as 1000 mg/L. There was also no mortality in the control. These data are used as read-across data to hydrocarbons, C13-C16, isoalkanes, cyclics, <2% aromatics.
The water accommodated fraction (WAF) of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, did not produce a 50% effect (mortality) with Chaetogammarus marinus at a loading of 10,000 mg/L after a 96-hour exposure. Therefore, the 96-hour LL50 is reported as >10,000 mg/L. There was no mortality at the 10,000 mg/L loading level after 96 hours. Therefore, the 96-hour NOELR for mortality is reported as 10,000 mg/L. There was also no mortality in the control. These data are used as read-across data to hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics. Although these analogs also contain normal hydrocarbons, which are not found in hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics, because their toxicological mode of action is the same as isoalkanes and cycloalkanes, and their hydrocarbon constituents have even less water solubility and consequently lower aqueous concentration, they would be expected to exhibit the same degree of toxicity - or in this case, the lack of acute toxic effects.
Based on these data, hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics, are not expected to produce acute toxic effects to invertebrates at saturation.

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Additional information

The water accommodated fraction (WAF) of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, did not produce a 50% effect (immobility) with Daphnia magna at a loading of 1000 mg/L after a 48-hour exposure. Therefore, the 48-hour LL50 is reported as >1000 mg/L. There was no mortality at the 1000 mg/L loading level after 48 hours. Therefore, the 48-hour LL0 for mortality is reported as 1000 mg/L. There was also no mortality in the control. These data are used as read-across data to hydrocarbons, C13-C16, isoalkanes, cyclics, <2% aromatics.

The water accommodated fraction (WAF) of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, did not produce a 50% effect (mortality) with Chaetogammarus marinus at a loading of 10,000 mg/L after a 96-hour exposure. Therefore, the 96-hour LL50 is reported as >10,000 mg/L. There was no mortality at the 10,000 mg/L loading level after 96 hours. Therefore, the 96-hour NOELR for mortality is reported as 10,000 mg/L. There was also no mortality in the control. These data are used as read-across data to hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics. Although these analogs also contain normal hydrocarbons, which are not found in hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics, because their toxicological mode of action is the same as isoalkanes and cycloalkanes, and their hydrocarbon constituents have even less water solubility and consequently lower aqueous concentration, they would be expected to exhibit the same degree of toxicity - or in this case, the lack of acute toxic effects.

Based on these data, hydrocarbons, C14-C19, isoalkanes, cyclics, <2% aromatics, are not expected to produce acute toxic effects to invertebrates at saturation.