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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The value of 74.9 mg (SO3)2-/L is put forward for the environmental classification of sulfite/disulfite compounds.	

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
74.9 mg/L

Additional information

Reliable acute toxicity data for freshwater invertebrates are available for thiosulfate, sulfite and dithionite compounds. The 48-h LC50 for daphnids (D. magna) ranging from 89 mg disodium disulfite/L to 230 mg ammonium thiosulfate/L, which corresponds to 74.9 mg/L to 248.2 mg/L sulfite equivalents, respectively.

All LC50 values are well above 50 mg/L (in terms of sulfite equivalents) indicating a low potential for acute toxicity to freshwater invertebrates.