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Sodium sulfite is used in the photography industry to protect developing solutions from oxidation, in the pulp and paper industry, in water treatment as an oxygen scavenger agent, as a desulfurizing and dechlorinating agent in the leather industry and as a bleaching agent in textile industry. It is used as a preservative to prevent dried fruit from discoloring. It finds application as a sulfonation and sulfomethylation agent in the chemical industry. It is involved in the production of sodium thiosulfate. Other applications include forth flotation ores, oil recovery and making dyes.
Cavka, A.; Martín, C.; Alriksson, B.; Mörtsell, M.; Jönsson, L. J. Techno-economic evaluation of conditioning with sodium sulfite for bioethanol production from softwood. Bioresour. Technol. 2015, 196, 129-135.
Du, F.; Alam, M. N.; Pawliszyn, J. Aptamer-functionalized solid phase microextraction-liquid chromatography/tandem mass spectrometry for selective enrichment and determination of thrombin. Anal. Chim. Acta. 2014, 845, 45-52.