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Due to the expected oxidation of sulfite to sulfate under environmental conditions (worst-case half life of 77h), and its physicochemical properties which make adsorption to sediments unlikely, the derivation of a PNEC for the terrestrial compartment is not feasible/appropriate:

-      due to rapid oxidation of sulfite/disulfite substances, no relevant test design and toxicity data can be generated

-      due to the lack of a relevant adsorption coefficient for sulfites/disulfites 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 sulfite/disulfite substances, long-term exposure of sediment organisms to this substance can be excluded.

Consequently, there is no need to derive a PNECterrestrial for sulfite/disulfite compounds.