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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

EC50/LC50 for freshwater invertebrates:
74.9 mg/L

Additional information

The reliable key study (BASF, 1990) on the acute toxicity of sulfite/disulfite used the cladoceran Daphnia magna as test species, and test substance was sodium metabisulfite (Na2S2O5). The reported 48h-EC50 was 89 mg test material/L, which corresponds to 30.0 mg S/L or 74.9 mg SO32-/L. According to the authors, observed effects were related to oxygen depletion as a result of the oxidation of sulfite.

Dowden and Bennett (1965) also reported the effects of sodium sulfite on D. magna. The presented 50h-TLm50 of 273 mg/L (173.2 mg SO32-/L) was approximately a factor of 2 higher than the BASF (1990) study.

The value of 74.9 mg SO32-/L is put forward for the environmental classification of sulfite/disulfite compounds.