In food industry as additive (E221) preservative, antioxidant and antimicrobic for fruits (dried, glazed and candled), vegetables, juices and fish (shrimps and prawns).
In starch and sweeteners production as bacteriostatic or as alkaline agent.
Photographic industry as preservative of developing bath (to avoid fast oxidation of the product) and as buffer in thiosulphates solutions (to avoid thiosulphate decomposition in presence of acids).