Hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics

Endpoint summary

Additional information

Acute Fish Toxicity:

A water accommodated fraction of hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics, produced a 96-hour LL50 value of >88,444 mg/L and LL0 value of 88,444 mg/L with rainbow trout, Oncorhynchus mykiss. No mortality was observed in the treatment test system. The water accommodated fraction of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, produced a 96-hour LL50 value of >1000 mg/L and LL0 value of 1000 mg/L with rainbow trout, Oncorhynchus mykiss. No mortality was observed in either the control or treatment test systems. The data from the latter study are used as supporting, read-across data to hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics.

Chronic Fish Toxicity:

The hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics, estimated freshwater fish 28-day NOELR (No Observed Effect Loading Rate) value is >1000 mg/l based on growth.

Acute Invertebrate Toxicity:

Freshwater:

The water accommodated fraction (WAF) of hydrocarbons, C11-C14, 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, C12-C16 isoalkanes, cyclics, <2% aromatics.

Marine:

The water accommodated fraction of hydrocarbons, C12-C16, 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 and no effects on swimming and feeding behavior were observed. Therefore, the 96-hour NOELR for these endpoints is reported as 10,000 mg/L. There was also no mortality in the control.

Chronic Invertebrate Toxicity:

Hydrocarbons, C11-C13, isoalkanes, <2% aromatics, showed no effects on Daphnia magna survival, reproduction, or length at a nominal loading of 1 mg/L. Therefore, the 21-Day No Observed Effect Loading Rate (NOELR) = 1.0 mg/L for these endpoints based upon nominal loading levels. These data are used as read-across data to hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics.

Algal Toxicity:

Growth in an alga culture, as measured by biomass and growth rate, exposed to a 1000 mg/L water accommodated fraction of hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics, was not inhibited when compared to the control after a 72-hour exposure. Therefore, the 72-hr EL50 and NOELR values for these two endpoints are reported as >1000 mg/L and 1000 mg/L, respectively. The data from this study are used as read-across data to hydrocarbons, C12-C16, isoalkanes, cyclics, <2% aromatics.

Toxicity to microorganisms:

The hydrocarbons, C11-C14, isoalkanes, <2% aromatics, estimated protozoan, Tetrahymena pyriformis, 48-hr EL50 value for this substance is >1000 mg/L based on growth inhibition. Isododecane at the highest loading rate, 2 ml/L, did not inhibit the respiration rate of Pseudomonas putida over an exposure period of 5 hours. The data from the latter study are used as supporting, read-across data to hydrocarbons, C11-C14, isoalkanes, cyclics, <2% aromatics.