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Sediment toxicity

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Description of key information

Findings from a chronic sediment OECD 225 study showed that the registered substance did not cause any long-term effects on reproduction and growth (biomass) in the benthic sediment blackworm, Lumbriculus variegatus, after 28 days of exposure in sediment at 0, 11, 33 and 101 mg/kg.  The 28-day NOEC was ≥ 101 mg/kg soil d.w. based on no observed adverse effects on reproduction and growth.  Hence, the registered substance showed no long-term toxicity or adverse effects to organisms in sediment.  No PNEC for sediment could be derived for quantitative risk assessment.  However, it is possible to qualitatively conclude that the registered substance does not pose an unacceptable risk to freshwater sediment-dwelling organisms

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater sediment:
101 mg/kg sediment dw

Additional information

A chronic sediment study (OECD 225) was recently performed to evaluate the long-term effects of the registered substance (reaction products of 1-decene, 1-dodecene and 1-octene, hydrogenated) on the freshwater sediment-dwelling benthic oligochaete,Lumbriculus variegatus, using a static exposure system in which the test substance was spiked in the sediment phase at concentrations of 0, 11, 33 and 101 mg/kg for 28 days (Sutherland, 2015).  

 

After 28 days of exposure, there were no statistically significant treatment-related effects on the reproductive output (number of live worms) or growth (e.g., biomass - dry weight) when the treatment groups (11, 33 and 101 mg/kg nominal) were compared to the control group (p= 0.05, Dunnett’s test). As such, the 28-day NOEC for both reproduction and growth is equal to or greater than the highest loading concentration tested (101 mg/kg). The 28-day EC10 value (reproduction and growth) is expected or can be deduced to be greater than 101 mg/kg since no differences were observed between the control and treated groups.

 

Overall, the findings from this chronic OECD 225 toxicity test indicate that the registered substance did not cause any long term effect on mortality, reproduction or growth in the benthicLumbriculus variegatusafter 28 days of exposure in sediment. In addition, no behavioral effects were observed in the blackworms when the treatment groups were compared with the control group. No mortality was observed at study termination.