Registration Dossier
Registration Dossier
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EC number: 914-103-1 | CAS number: -
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
With high probability, not harmful to sediment dwelling organisms.
Key value for chemical safety assessment
Additional information
According to Annex IX, column II a sediment study does not need to be conducted of direct and indirect exposure of sediment is unlikely. The substance will dissociate in contact in water. The ionic nature and high water solubility of the dissociation products indicate that an exposure of the sediment compartment is unlikely.
Furthermore are detrimental effects due to the physico-chemical properties of the reaction mass or the single components to sediment organisms not expected. This is supported by the results for the aquatic toxicity indicating no negative effect of the substance to aquatic organisms. Thus comparable results are expected for sediment organisms.
The assumption is supported by available studies for ammonium sulphate and sodium sulphate respectively. The oligochaete, Lumbriculus variegates, was exposed to a maximum nominal concentration of 100 mg/L ammonium sulphate for 96 hours. No mortality occurred at this highest dose and therefore a LC50 could not be calculated (Ewell, 1986, cited in OECD SIDS 2007). For sodium sulphate, a study using Trycorythus sp. determined a 96 h LC50 of 660 mg/L. Both studies indicate that these substances have little toxic effect on sediment dwelling organisms with LC50 values above 100 mg/L (Goetsch and Palmer, 1997, cited in OECD SIDS 2005).
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