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Long-term toxicity to aquatic invertebrates

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Description of key information

The value of 8.41 mg (SO3)2-/L is put forward for the environmental classification and effects assessment of sulfite/disulfite compounds.	

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater invertebrates:
8.41 mg/L

Additional information

The reliable key study (BASF, 1990) on the chronic toxicity of sulfite/disulfite used the cladoceran Daphnia magna as test species, and test substance was sodium metabisulfite (Na2S2O5). The reported 21d-NOEC (endpoint: reproduction rate and mortality) was >10 mg test material/L, which corresponds to 3.37 mg S/L or 8.41 mg SO32-/L. Physicochemical properties of the test media were monitored during the test period, and both pH (7.5-8.0) and oxygen content (>7 mg/L) met the validity criteria set for this type of test.

The value of 8.41 mg SO32-/L is put forward for the environmental classification and effects assessment of sulfite/disulfite compounds.