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Article | REF: W2702 V1

Oxidation and reduction applied to water treatment - Ozone – Other oxidants – Advanced oxidation – Reducing agents

Authors: Sylvie BAIG, Pierre MOUCHET

Publication date: February 10, 2010

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4. Main reducers

4.1 Sodium sulfite

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4.1.1 Properties

Sodium sulfite is a salt with the empirical formula Na 2 SO 3 . In anhydrous form, it is stable in dry air, whereas when exposed to moist air, it is rapidly oxidized to sodium sulfate. At around 600°C, it decomposes into sodium sulfate and sodium sulfide. In the presence of sulfur, it reacts to form sodium thiosulfate. Properties are listed in Table 19

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