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Description of key information

After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes. However, since sodium nitrite shows a very low vapour pressure evaporation is negligible; therefore, phototransformation in air is of minor importance.

Key value for chemical safety assessment

Additional information

Indirect photo-oxidation by hydroxy radicals (1500000 molecule/cm3) is predicted to occur with a half-life estimated at 82.3 days (calculated using AOPWIN v1.91 at 25 °C, rate constant, 1.30 x E-13 cm3/molecule/sec, 12 hour day).