This particular use can be set up to measure the oxygen content of water through a long series of reactions in the Winkler test for dissolved oxygen.
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In this application to photographic processing, discovered by John Herschel and used for both film and photographic paper processing, the sodium thiosulfate is known as a photographic fixer, and is often referred to as hypo, from the original chemical name, hyposulphite of soda.
sodium | Sodium fluoroacetate | Sodium sulfate | Sodium hydroxide | Sodium thiopental | Sodium nitrate | sodium hydroxide | Sodium dodecyl sulfate | Sodium | Thiosulfate-citrate-bile salts-sucrose agar | Thiosulfate | sodium valproate | Sodium Tungsten Bronze | Sodium tungsten bronze | Sodium sesquicarbonate | Sodium orthovanadate | Sodium nitrite | sodium nitrate | Sodium hypochlorite | Sodium hydrosulfide | Sodium cyanide | Sodium citrate | Sodium-calcium exchanger | Sodium bicarbonate | sodium bicarbonate | Fractional sodium excretion |