Registration Dossier
Registration Dossier
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EC number: 231-977-3 | CAS number: 7783-06-4
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The study from Kärmas (2004) is retained as the key study for this endpoint, with a NOEC of 13.3 mg/L and an EC50 of 29 mg/L.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 29 mg/L
- EC10 or NOEC for microorganisms:
- 13.3 mg/L
Additional information
Two studies were conducted to assess the toxicity of hydrogen sulphide to microorganisms. The one from Kärmas (2004) was conducted according to ISO 8192 on activated sludge of a predominantly industrial sewage, but some information is lacking, like the duration of the test. An EC50 of 29 mg/L was determined (as total sulphide), based on inhibition of oxygen consumption.
In a second study from Küster et al. (2005) is a non-standard test, where the luminescent bacterium Vibrio fischeri was exposed for 30 minutes to hydrogen sulphide, synthesized electrochemically. The measured EC50-30min measured was 9.4 mg/L (as H2S).
Vibrio fischeri is a marine bacterium, with limited relevance for STP functioning. Therefore, the Kärmas study is retained as the key study for this endpoint, with an EC50 of 29 mg/L.
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