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Hazard Predictions

• No known hazardous reaction

No evidence was found for a hazardous reaction between these reactive groups under most conditions. Because of the nature of the members of the Weak Reducing Agents group we would not expect reaction kinetics to yield hazardous conditions. We urge chemists to perform testing to ensure that hazards do not occur under conditions appropriate to the scenario.

However, evidence of a potentially hazardous reaction under unusual conditions was found: With water, sodium hydrosulfite slowly oxidizes to sodium bisulfite and later to sulfur dioxide and sodium hydroxide with evolution of heat. The chemical may ignite combustible materials in contact with moisture or air. Moist sodium hydrosulfite is likely to ignite upon drying (Hazardous Chemical Reactions, NFPA 491M, Quincy (MA), National Fire Protection Association, 10th ed., 1991). This compound is soluble in water and would dissolve smoothly with no evolution of gases in most spills. However, large spills into small amounts of water could cause heating due to heat of dissolution, possibly resulting in decomposition and evolution of SO2 gas and possibly H2S gas (Brown, D. F., et al. (2000) Development of the Table of Initial Isolation and Protective Action Distances for the 2000 Emergency Response Guidebook, ANL/DIS-00-1, Argonne National Laboratory, Argonne IL).