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Sediment toxicity

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Description of key information

As in surface waters, LiPF6 itself will not be present in freshwater or marine sediments: rather the F-, Li+ and phosphate ions will be present in the unexpected event of significant LiPF6 release. From the reported data on toxicity to mammalian and aquatic organisms, it is clear that fluoride is the most toxic of the degradation products.  In a study using spiked sediment with fish, mayfly and midge larvae plus amphipods, a lowest NOEC of 58 mg fluoride/kg dry weight was determined.  This corresponds to an LiPF6 NOEC of 77.3 mg/kg sediment dw (based on fluoride toxicity following complete F- release).

Key value for chemical safety assessment

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

Additional information

Metcalfe-Smith et al (2003) investigated the long-term toxicity of freshwater lake sediment spiked with sodium fluoride to sediment-foraging fish (fathead minnow: 21-day exposure), mayfly and midge larvae (21- and 10-day exposure respectively) and amphipods (Hyalella azteca: 28-day exposure). H. azteca proved to be clearly the most sensitive to fluoride, based on both survival (LC50 1,114 mgF-/kg dry weight) and growth (IC25 290.2 mgF-/kg dry weight): while no NOEC value was reported, it is possible to estimate from the data a NOEC value of 58 mgF-/kg dry weight, conservatively calculated as one fifth of the IC25 for growth. This corresponds to an LiPF6 NOEC of 77.3 mg/kg sediment dw (based on fluoride toxicity following complete F- release).