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EC number: 231-131-3 | CAS number: 7440-22-4
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
The most sensitive endpoint is a 10-day NOEC (growth) for Hyalella azteca of 12 mg Ag/kg dry weight (Call et al. 2006).
Key value for chemical safety assessment
Additional information
Long-term NOECs are available for three benthic species:Chironomus tentans (Call et al. 1999), Hyalella azteca (Hirsch 1998a, Call et al. 2006) and Lumbriculus variegatus (Hirsch 1998b). The most sensitive reported sediment NOEC is 12 mg Ag/kg dry sediment for growth of the amphipod Hyalella azteca exposed after a 10 day exposure to contaminated sediments (Call et al. 2006). The organic carbon content of the sediment used to generate this NOEC was 0.29%.
The derivation of the PNECsediment, including the basis for a correction for sediment organic carbon concentration is described in the appended PNEC summary document.
Berry et al. (1999) exposed the marine amphipod Ampelisca abdita for 10 days to two marine sediments with different amounts of acid-volatile sulfide spiked with silver (Sediment 1: 2.7 – 4415 mg silver/kg dw, Sediment 2: 2.7 – 72,770 mg silver/kg dw). The EC10 values for these two sediments were 4415 and 6626 mg/kg, respectively. In general, sediment treatments with an excess of acid-volatile sulfide (AVS) relative to simultaneously extracted metal were not toxic to marine amphipods.
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