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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

Taking into account the instability of sodiumdithionite under environmental conditions (decomposition/hydrolysis to sulfite and sulfate) and its physicochemial properties which make adsorption to soil unlikely, the derivation of a PNEC for the terrestrial compartment is not feasible/appropriate.

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Additional information

Taking into account the instability of sodiumdithionite under environmental conditions (decomposition to sulfite and sulfate) and its physicochemial properties which make adsorption to soil unlikely, the derivation of a PNEC for the terrestrial compartment is not feasible/appropriate:

-      due to rapid oxidation of sodium dithionite, no relevant test design and toxicity data can be generated

-      due to the lack of a relevant adsorption coefficient for dithionites to soil, the equilibrium partitioning method for deriving a PNECterrestrial is not applicable

-      taking into account the industrial use, exposure pathways and environmental fate of sodium dithionite, long-term exposure of sediment organisms to this substance can be excluded.

Consequently, there is no need to derive a PNECterrestrial for sodium dithionite.