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In a 96h acute GLP toxicity study, Brachydanio rerio was exposed to a C20 -30 hydrogenated polyalphaolefin test substance at 10g/l in drinking water. No mortalities were observed at 24h, 48h, 72h, or 96h.

In an acute GLP guideline toxicity study using a C10/C12 polyalphaolefin, daphnia magna were exposed to a water accommodated fraction (WAF) at a loading rate of 1000mg/l for 48 hours under static test conditions. The measured total organic content of this solution was1.15mg/l. No immobilisation or adverse reactions to exposure were recorded during this period and hence the 48 hour effective loading rate (ELR50) and NOEC were both greater than or equal to 1000mg/l.

In an acute GLP guideline toxicity study using a C10/C12 polyalphaolefin, algae were exposed to a water accommodated fraction (WAF) at a loading rate of 1000mg/l for 48 hours under static test conditions. The measured total organic content could not be reliably distinguished from background levels. No inhibition of growth rate or biomass production or any other or adverse reactions to exposure were recorded during this period and hence the 96 hour effective loading rate (ELR50) and NOEC were both greater than or equal to 1000mg/l.

A C20 -C30 hydrogenated polyalphaolefin was investigated for its chronic toxic effect on bacteria (Pseudomonas putida) according to DIN 38412 Part 8, up to a maximum concentration of 10g/l in water. Under the conditions of this study no toxic effect could be observed and therefore a toxic concentration could not be defined. The toxicity to micro-organisms of Pentadecane, 7-methylene mixed with 1-tetradecene, dimers and trimers, hydrogenated is likely to be similar to this tested substance

Available data suggests that the substance will exhibit no ecotoxicity up to and including the maximum solubility in water. This conclusion is supported by QSAR modelling. Based on the results of this data, Pentadecane, 7-methylene mixed with 1-tetradecene, dimers and trimers, hydrogenated does not need to be classified for environmental toxicity under either the EU DSD or the EU GHS classification regulation.

In an acute toxicity study which conformed to Paris Commission and ASTM guidelines, the sediment dwelling organism Corophium volutator (mud shrimp) was exposed to two substances with similar properties to "Pentadecane, 7-methylene mixed with 1-tetradecene, dimers and trimers, hydrogenated", namely "octene, oligomer, hydrogenated" and 1 -decene, dimer, unhydrogenated" at concentrations between 135 and 44000mg/kg dry weight sediment. Similar LC50's of 16,400mg/kg and 18,900 mg/kg dry sediment were obtained suggesting virtually no toxicity to the organism. However, a significant fraction of mortality was observed at low concentrations with a very modest increase in mortality as concentrations increased. This can be interpreted as the substances presenting a limited but fixed hazard which is not closely linked to the quantity discharged. Because of structural and chemical similarity, these test result can be extrapolated as indicative of the sediment toxicity of the substance Pentadecane, 7-methylene mixed with 1-tetradecene, dimers and trimers, hydrogenated. It should be noted that the test species can tolerate a wide range of salinities from nearly full saline to almost fresh water and can therefore be considered as a good representative of toxicity in both fresh and marine waters.