Registration Dossier
Registration Dossier
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EC number: 908-552-2 | CAS number: -
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
No reliable studies were identified for this endpoint.
Key value for chemical safety assessment
Additional information
Four studies were identified as relevant for this endpoint. For one of them, the primary source was not available. Another publication was in Japanese, hampering thorough evaluation of the reliability of the experimental results. Consequently a Klimisch 4 score was assigned to these two studies. One of these studies reported a 138-d NOEC (survival) of < 0.015 mg S2-/L for mayfly larvae of the species Hexagenia limbata (Oseid and Smith, 1975). The other study reported a 15-d LC50 of 0.0253 mg H2S/L for the prawn Macrobrachium nipponense (Kang et al., 1995). The other two studies were considered not reliable (Klimisch 3). One of these studies only reported 50% survival times (LT50) for the arcid blood clam Scapharca inaequivalvis under four different conditions (oxic control, oxia + sulfide, anoxic control, anoxia + sulfide) (de Zwaan et al., 1993). The other study reported a NOEC (for the endpoints survival and growht) of 0.002 mg H2S/L for the amphipod Gammarus pseudolimnaeus. Because no reliable studies have been identified to cover this endpoint, the necessity to conduct a new test should be evaluated based on the outcome of the CSA. Because the CSA demonstrated that no H2S is released to the aquatic environment as a result of the identified uses when the proposed risk management measures are applied, it is not considered necessary to conduct a new test for this endpoint. Moreover, taking into account the mode of toxic action of H2S and the supporting evidence that the acute to chronic ratio for H2S toxicity is approximately one, chronic testing is not expected to yield additional useful information. No reliable long-term data were identified for sulfate either.
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