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Short-term toxicity to aquatic invertebrates

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Description of key information

The value of 174 mg S2O32-/L is put forward for the environmental classification of thiosulfate substances.	

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
174 mg/L

Additional information

Two reliable studies that reported on the toxicity of ammonium thiosulfate on invertebrate species: the cladoceran Daphnia magna and the marine mysid shrimp Mysoidopsis bahia. As guidance recommends tests like the 48h-test with D. magna for classification purposes, the value of 230 mg ammonium thiosulfate is selected as key value for this endpoint

Expressing this 48h-EC50 as thiosulfate or sulfite results in a value of 174 mg S2O32-/L and 248.2 mg SO32-/L.

 

Substance

 

Test organism

LC50

(mg test item/L)

Reference

(NH4)S2O3

Daphnia magna

230 (48h)

Springborn Bionomics, 1986

(NH4)S2O3

Mysidopsis bahia

77 (96h)

Springborn Bionomics, 1994

 

 

The value of 174 mg S2O32-/L is put forward for the environmental classification of thiosulfate substances.