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EC number: 265-150-3
CAS number: 64742-48-9
A complex combination of hydrocarbons obtained by treating a petroleum fraction with hydrogen in the presence of a catalyst. It consists of hydrocarbons having carbon numbers predominantly in the range of C6 through C13 and boiling in the range of approximately 65°C to 230°C (149°F to 446°F).
Actual exposure concentrations were quite stable and close to nominal values.Even though a range finding test was performed before the definitiveexperiments were carried out, no significant effects were found in the definitive experiments at the tested concentrations. Therefore, no NOECs could be calculated. Tissue concentrations of undecane were measured in plant samples, showing that the hydrocarbon was adsorbed to the plant although no significant toxicity occurred. Low concentrations of test compound were measured in the controls.
High variation between replicated plants was observed for some treatments. Therefore, a statistical variance analysis was performed to identify trends related to hydrocarbon exposure. The main results of this analysis for the experiment are negative trend observed forS. nigrum, B. campestris and P. vulgaris shoot biomass andP. ovata leaf ear length.
Implications for the gasoline risk assessment.The highest nominal test concentrations (in ppmV) were recalculated to g/m3using the density of the test compounds (0.74 g/cm3). In this way, the highest test concentrations, where still no significant phytotoxic effects were observed, could be compared with environmental PECs for the relevant hydrocarbon block from the gasoline risk assessment (block 7). The highest test concentrations were 6.7 g/m3. This single compound concentration is up to 106times higher than PECs reported for the block in the gasoline risk assessment, clearly showing that no risk for exposed vegetation due to the presence of these compounds in the atmosphere is expected.
Atmospheric Predicted Environmental Concentrations
C9-C11 n+iso paraffins
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