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Sediment toxicity

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Description of key information

Due to the instability of sodiumdithionite under environmental conditions (decomposition/hydrolysios to sulfite and sulfate) and its physicochemical properties which make adsorption to sediments unlikely, the derivation of a PNEC for the sediment compartment is not feasible/appropriate

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Additional information

Due to the instability of sodiumdithionite under environmental conditions (decomposition to sulfite and sulfate) and its physicochemical properties which make adsorption to sediments unlikely, the derivation of a PNEC for the sediment 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 sediment, the equilibrium partitioning method for deriving a PNECsediment 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 PNECsediment for sodium dithionite.