Registration Dossier
Registration Dossier
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EC number: 231-977-3 | CAS number: 7783-06-4
Endpoint summary
Administrative data
Description of key information
Additional information
There are tests on acute toxicity of hydrogen sulfide to three trophic levels available. For fish, a 96h-LC50 of 19.8 µg/L, obtained in a test on Lepomis macrochirus (Smith 1976a), was chosen as key study. A similar toxicity was determined for invertebrates, a 96h-LC50 of 20 µg/L for Baetis vagans (Oseid 1974) was obtained. Algae are much less sensitive, a 24-EC50 of 1.87 mg/L (Scenedesmus vacuolatus) was determined (Kuester 2005).
Long-term effect values were determined for fish and algae. In a test on Lepomis macrochirus a 826d-NOEC of 1.5 µg/L (Smith 1976a) was obtained for the population relevant endpoints growth rate, survival and reproduction which is used for chemical safety assessment. In a test on the marine alga Skeletonema costatum a 4h-NOEC of 40.8 µg/L was determined. As no NOEC for a freshwater algae is available, this value is also considered as the relevant NOEC for freshwater algae. Chronic tests on invertebrates are not available.
Overall, it can be concluded that hydrogen sulfide is highly toxic to fish and invertebrates, the effect concentrations on algae are higher.
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