Registration Dossier
Registration Dossier
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EC number: 233-340-5 | CAS number: 10124-53-5
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
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
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 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.
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