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Long-term toxicity to fish

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Description of key information

A long-term NOEC of 200.5 mg (SO3)2-/L for fish is put forward for the environmental classification and effects assessment of sulfite/disulfite compouds.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
200.5 mg/L

Additional information

One reliable chronic fish toxicity study for sodium sulfite is available. The respective 34-d NOEC for reproduction of early-life stage of Danio rerio amounts to 316 mg sodium sulfite/L (corresponding to 200.5 mg/L SO32—equivalents, respectively). The chronic NOEC is in the same magnitude but almost a factor 2 higher than the lowest acute 96-h LC50 for fish. However, the acute toxicity is caused by indirect effect of oxygen depletion and pH-decrease. Therefore, the long-term test is considered to be more realistic to identify substance-specific toxicity without indirect effects.

Thus, sulfite, thiosulfate and dithionate appear to have a low potential for chronic toxicity to fish.