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Environmental fate & pathways

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In aqueous solution, the substance is completely dissociated into the sodium ion (Na+) and the ferrocyanide anion ((Fe(CN)6)4-). Hydrolysis of sodium ferrocyanide is not expected to occur due to absence of hydrolysable groups in the molecule.

Based on public data aqueous solutions of alkali metal ferrocyanides are rather stable at room temperature. These hexacyanoferrate complexes are considered to be the most stable ferrocyanide/ferricyanide complexes, only limited decomposition is reported. However, these ferrocyanide complexes can be degraded by photolysis, especially by sunlight, to form low concentrations of free cyanide (Wang et al.). In another publication (Thomas et al.) it is stated that after a 30 min. exposure to sunlight 15.5 mg/L sodium ferrocyanide would release 3.8 mg/L of cyanide, after which the concentration remains fairly constant.