Registration Dossier
Registration Dossier
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EC number: 914-103-1 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
No data on the toxicity of the reaction mass of ammonium sulphate and potassium sulfate and sodium sulphate to aquatic organisms are available. Therefore, the assessment of the toxicity is based on test on the single components of the reaction mass. In aqueous solution, the components of the reaction mass (ammonium sulphate, potassium sulfate and sodium sulphate) completely dissociate into their constituent ions and the sulphate anion (SO42-). All ions occur naturally in the environment and are in part taken up by organisms as essential nutrients. Thus, organisms are able to actively regulate the uptake and the concentration of the ions. Therefore the substances are considered as generally not toxic to aquatic organisms. Regarding the three components of the reaction mass and their respective ions, ammonium is expected of higher concern compared to potassium and sodium. Thus the assessment is mainly based on data available for ammonium sulphate.
The most sensitive reaction was detected in a study on the acute toxicity of ammonium sulphate to fish. A LC50 (96 h) of ca. 173 mg/L for large rainbow trout (Salmo gairdneri) was detected. For aquatic invertebrates, the lowest EC50 value was obtained in Ceriodaphnia acanthina at 121.7 mg/L. Chronic toxicity tests are available for two trophic levels i.e. for fish and for algae. The NOEC determined in fish (Oncorhynchus gorbuscha (humpback salmon) was 11 mg/L. For algae the growth of the freshwater species Chlorella vulgaris in presence of ammonium sulphate was tested. The growth was inhibited by 50% at approx. 2700 mg/L ammonium sulphate. The PNECfreshwater has been derived from the lowest species mean acute value for 121.7 mg/L. An assessment factor of 1000 was applied.
The PNEC STP is based on a study investigating the inhibition of nitrification by ammonium sulphate. No inhibition was detected in 14 different strains of ammonium oxidising bacteria up to a concentration of 94 mg/L. This concentration was taken as EC10 and an assessment factor of 1 was applied.
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